Regal makes this point very well in the explanation, but it is worth repeating. Done well, this is an miracle that the spectators will remember for a long time.
While it takes a little bit of preparation, and practice of what can be a difficult move, this is a perfect place to practice this move. Some tricks lend themselves to "on the job" practice. That's how I learned the top-change. This is a piece that will allow you to practice the bottom deal from a very small packet (the easiest way) under pressure. I have not seen an effect better suited to learning this move.
But the thing is that this is a great trick. In addition to allowing you to learn a move and do it under pressure, it is a trick that will KILL under the right conditions. This is not the trick to do when you are in a hurry and have very limited time with each group. This is a piece for the end of the night when things have slowed down and you want to impress a small group (hopefully including the booker).
Highly recommended for a number of reasons. Don't pass this by, it's too good.

BTW, David, SLAP

This is a really jarring effect! I love “what are the odds?” kind of tricks, but Symmetry is seriously one of my favorites because the spectator REALLY DOES have a TOTALLY FREE choice! You are NOT forcing any cards on them!

There is a gimmick involved, but it’s invisible and takes no skill and about 10 minutes to make. There are only two very simple moves, so this is great for beginners, too.

David teaches a simple little bonus effect at the beginning of the video to introduce the method and concept, and it’s a great little trick on its own, that can be performed with any borrowed deck.

Symmetry reminds me of other effects that require much more advanced sleight of hand skills. So if you’re not a move-monkey, you might want to give this one a try.

I also like that this can play so well as a magic trick or a mentalism effect.

This is a great effect. Anytime you can get away from the standard "pick a card" trick, you make the other stuff you do even stronger so, for me, this is worth learning. However, I don't agree with the reviewers who say this is "easy" or only requires "minimal sleights." I have been doing card magic semi-professionally for nearly 40 years; I have never needed and therefore never learned the one critical sleight needed here. I understand that practice is always a requisite but, IMHO, Regal glosses over the mechanics and many, like me, will need to find another tutorial to thoroughly understand it and get it working. Hence, I am rating this four stars. Having said that, if you're willing to put in the extra effort this is a very strong effect to learn and perform.

Full disclosure: I received a free copy of this trick with a request to write a review. With that out of the way:

This effect is an excellent one. Very clean coincidence effect, instant reset (if you want: see below), easy to do and looks super clean (because it mostly is). This is the type of trick that gets great redactions.

However, I have a couple of complaints with this download, although neither of them are with the trick itself, but rather with the presentation of the trick.

First: the advertising demo seemed to give me the impression that there is nothing special about the deck. This isn't entirely true, there is 'something' that needs to be done with the deck in advance, and while technically you could go ahead and use the deck as a regular deck when you're done with this trick, you probably wouldn't want to (will make reset a pain). The deck is still examinable (after the trick is done), but you'll need to do a reset afterwards if you want to preform this trick again.

Second complaint I have: there is one scenario that could come up which throws the trick for a slight loop. Now, it doesn't entirely derail the trick (as a matter of fact, that scenario came up in one of the demo performances and David still completed the trick spectacularly), but should still warrant some mention in the explanation. As I was watching the explanation, I was expecting David to mention this scenario near the end, and was disappointed when it wasn't mentioned. Now, it's not too difficult to work around this issue (I thought up two possible simple workarounds while writing this review), but I feel it should have been mentioned in the explanation, since otherwise it is slightly incomplete.

Otherwise, the teaching, as David's teaching usually is, is excellent.

In summary:

Pros:
Super strong effect
Spectator has free choice
Easy reset (if you don't have the deck out for examination or use it for another trick)
Everything is examinable after the fact, if you don't want to reset.

Cons:
Requires a minimal amount of pre-work to set up the deck
Tedious reset if you don't use the easy reset method
Very slight amount of explanation is lacking
I don't like the demo video

In conclusion: the trick itself would warrant 5 stars, and the fact that the only real gripes I have are somewhat tangential can attest to the strength of the trick. However,I can't disregard my two main concerns, so that brings my score down a bit to what would probably be somewhere between 3 and 4 stars, so I'm rounding up to 4.

I really like David’s pace that he performed at, and by this I mean everything is slow enough for everyone to totally understand what is going on , and at the same time the micro movements needed here are masked
COMPLETELY.
A utility move is also taught here and again this is expert advice & tuition, and goes completely under the radar

Great trick if your hands' aren't arthritic.

I have been doing this trick occasionally for a few months but I have a question for you Symmetry dudes and dudettes. In the trailer, the spectator, on the last card he chooses, points to the top card of the deck instead of pointing toward one near the middle. No problem since that card matches the bottom card of the performer’s hand. The problem is, what do you do if he points to the top card after just one or two cards are chosen? My solution was, if he chooses the top card as his very first card, just lay it down where his cards are going to go and proceed with the trick normally since the bottom cards are now a match.Then, when you’re ready to turn up all of the cards after they have all been laid down, slide both packets backward except for the bottom cards, setting them aside, calling them predictions. Then, as normal, you do your special move, then the spectator lays down his top card which is a match. You go through all of the cards, then, at the end, for the grand finale, turn up the first two cards you laid down earlier, the bottom cards of each packet, showing that your prediction was correct. I realize this is not very inventive, so I’m wondering if someone out there has a better idea in case this situation arises. It has never arisen in the many times that I have performed Symmetry, but you know how that goes-someday it will and I would prefer to have a better solution instead of the rather lame idea I had of making a prediction.

Having said all of that, it is a wonderful trick, and the reactions I have gotten from it have been very, very good.

If anyone has a solution in case the above situation does, in fact, occur, I would be very appreciative for that advice.

A nice effect.

Strong effect in which cards picked by the spectator and performer match, i.e., King of Hearts and King of Diamonds. Looks totally fair. Involves an easy sleight. Attractively priced.

Marvin Kaye
Author, "The Handbook of Mental Magic"

An effect with an ungaffed deck. Learn basic moves and be amazing.