Hey there,
I'm here to give you unbiased answers in regards to the effect (no offense Rick).
1) This effect is very simple to do after the gimmick is constructed (which is also simple to do). I don't consider the gimmick "heavy" by an means. It's a great miracle that fits in your pocket.
2)This is actually really practical in regards to performing for a live audience. There are many effects I buy and end up not using because of the reliability in practicality. This one is a winner; and that comes from someone who has put in 10 years into the art.
3) Not one of your questions, but the routine and its multiple phases is what makes this effect a great bang for your buck!
Hope that helps you out!