This is a great effect with excellent video instruction. I'm only a novice and believe even a
beginner can pick this up with sufficient practice.
My only concern is that one of the gimmicks
won't usually match what it is swapped in for (and I know why). However, I don't believe most
spectators will notice. It's probably my own paradigm/over thinking.
I'll let you know if my
thoughts change after I begin performing it regularly.