I have to give a lot of credit to the thinking behind this one, because the gaffs are a very good
solution for performing an Ace Assembly without having to do any false lifts or false counts.
My biggest problem with this sort of routine is that the cards can't be examined. When you do
these sorts of "magical" hands-off card transformations, it's only natural for the spectator to want
to examine the cards, as their minds search for a solution. Unfortunately, the trick ends so dirty,
you'll feel very exposed.
I also think you need to be very careful about time misdirection.
Because the gaff requires different spreading techniques, the spectators will likely notice that it
looks different, if you do spreads too soon after one another. They won't necessarily know what it
means, but subconsciously at least, it'll seem "wrong".
Despite these complaints, I still
think this is a worthwhile effect, particularly for a beginner. A more advanced card handler would
probably want to just stick with the standard version that requires basic sleights.
Yes, you end dirty. This is the kind of effect that you do only after you've established credibility. You establish yourself as a competent performer using a regular deck. Do effects where the spectators handle and examine the cards. Though never mention that they are "normal cards" or anything of the sort. Don't run if you're not being chased. After you've established credibility and amazed your spectators, use your favorite deck switch and blow them away with this routine.
In fact a great idea would be to learn an ungimmicked ace assembly, and do it early in a routine. Then to close the set, offer to repeat the effect but under more impossible conditions using 'Aces in their Faces'.