Since everyone has given good reviews, I want to give some cons to make it fair for people considering buying interlace.
Yes it is a good trick once you take the time to install the gimmick. It also takes another person to help you at one point of the set up which will expose the secret to that person. They claim interlace is angle proof. This is not correct. You cannot have anyone standing behind or on the sides of you while you perform this. I am overall glad that I purchased interlace but I was disappointed in the angles considering I perform at restaurants with tables of people watching from all the different angles.
This will take some practice to get it down smoothly. You cannot borrow a ring and then do a french drop to make it disappear. It is a little gimmicky.
I like interlace but I want to be fair in the review since all the other reviews make this sound like it is the perfect trick and you cannot go wrong by purchasing it.

Please buy this product if you wish to perform real magic to the spectators, do not pay attention to the price, whether you have the money or not, this is an absolute miracle, that, when presented correctly, is the most practical stunner possible. This is never anticipated by spectators, and therefore they think nothing of the moves you do. I use this with Richard Sanders Any Ring silk, and allow the spectator to hold their ring through the entire routine before revealing it on my shoelace. Once the gimmick is installed, you can use it infinite times, with an almost instant reset. This can be done in almost any situation possible, Stage, Parlor, Stand up, Table hopping, close up, street, anywhere you can stand up. The initial setup is not too lengthy, and once it is done, the gimmick can in seconds be put into any shoe with a shoelace, whether it be white or black laces. I advise you, if you wish to perform great magic for your spectators, buy this. I must Credit Rich with creating what is, in my opinion, the greatest, most impossible, magical, and practical ring flight routine possible. Please purchase this item to improve the art of magic in the minds of the spectators.

I didn't get this from penguin, I got it fron richard himself with some other dvd:s. It'sc a great effect and everithing is explained in detail. The only bad part is the vanish of the ring. you have to go to youre pockets two times, and i dont think that's clean enough for such a great effect.. Otherwise it is amazing

This effect is really strong! Yet easy to perform. You do not need to go near your shoes to reveal the effect. Just pull up the pants so that your lace can be seen and the ring will be nicely wrapped around your lace. It can be done with a borrowed ring. Skill wise, there are no complicated sleights - just very simple handling is required. Excellent close up magic effect.

I like this effect but you are very limited as to when you can use it. You can't do it always depending on what pants you wear and you do need to be somewhere where it is somewhat noisy otherwise people will hear it. Not for me but it's an alright effect..

This trick is a killer, and please don't worry about the vanish!!!! I read in the reviews, that people had problems with the vanish of the ring: PLEASE BUY ANY RING BY RICHARD SANDERS, this will eliminate all problems, you will have plenty of time to set up the ring and after that, the ring will be on your shoelace, but at the same time, they think they're holding it in their own hands!!! Very strong and easy trick in combination with any ring!!! Do first a ring to ring box and afterwards ring to shoelace!!!!

I combine this with a ring on string trick, and it is Killer. Just a great trick. HOwever, it does take considerable set up, and if you lose the parts, it really stinks because there aren't spares. But, it is PERFECT for restaurant that I do. Once set up, it is fairly easy to do, and repeatable.

Interlace is a really great effect and really blows people away! It's a cool principle and if you give it the time to practice and the preparations, you will have a killer effect!

There's only one preparation you have to do, but you only have to do that once, but when you're done with it, the trick resets in seconds!

That's the reason I only gave it four stars. Some people might think, when they recieve it "Oh what a ripoff, I'll never get this thing to work", well, just be patient! Trust me it will be worth it!!!

This effect is so good it should be on tv. A borrowed ring vanishes and appears on your shoe! Cool right? It really happens and the method behind it is pretty insane. Richard is a creative guy. It's practical and the only thing that bummed me out is the setup. I would go somewhere to have this professionally done. Richard Sanders is a great teacher of magic and you learn various methods for the vanish and he goes over the whole setup with you in detail. This is a winner and for the money it is priceless for something that you can perform at professional shows. 2 thumbs up!

Yes, it's a little pricey. But the effect kills. I'm not going to lie. This one is a pain in the butt to make / have made and installed. But, the effect made it so worth the effort. The first time I used this as the ending to a three phase ring routine, the response from the audience blew -ME- away! It was that powerful.

Now, it's just one of those effects I never do a show without. It take practice and I recommend this for serious entertainers only. However, you will find that this is one of those things that makes people talk! That means repete business.