One move I refuse to do and never will, is the top change. There are several people I consult and practice with (We critique each other) We're always honest with each other about what we can and cannot see. and so far we all refuse to do this move. This has nothing to do with practice. This is just one of those moves that is so easliy detected, that I just avoid it altogether... It's a really bad move. Regardless of who says what, the top change is always detectable, and is always seen no matter what angle you're at, and how fast or slow you attempt it, and regardless if you do and do not move your arm and hand the deck is in. Due to none of us having ever been able to do this without being detected. I've come to the conclusion that this is possibly one of the worst card moves in history to ever surface and only amateurs who do not know any better will use this move.