I've been using my deck for a while now and it does need practise to use flawlessly. But because of the fact that it can be shuffled, a lot more things are possible.
Other than a spectator shuffle then ...no. That is the only advantage. The magician can shuffle an Instanto or Mark Oberon's version as much as he wants.
If the spectator shuffling the deck is really important to you then it is a good improvement. So you want to concern yourself with how easy is it to use. If it is easier than the other methods then it is a more significant improvement than letting a spectator shuffle because there are a lot of magicians who wouldn't really bother with a spectator shuffle for an effect like that. Cutting to any card in the deck is generally a longer routine. Specs can't shuffle well usually and that wastes a lot of time. For some effects it works for others it just bores the rest of the spectators. Doesn't mean you don't have a good idea there but be realistic about the contribution.