As others have said, the effect looks great on camera, but if you're doing it in a closeup setting
there are some elements of the gimmick that could flash. In live performance it would need to be
done at a distance, 4' or so away from the spectators and in low light for best results. The bills
are not examinable unless you figure a way to switch n' ditch the gimmick for a real bill.
There is a lot of setup involved to construct the gimmick but once you've made it it's good for
lots of performances. The main part of the gimmick is very sturdy and made to stand up to mild
abuse.
The biggest disappointment for me is that the main part of the gimmick is geared
more towards european currency. I suppose it could be a fun trick to "convert" your own currency
from euro to US bills, but the size difference would be a problem. Additionally most of the bills
look really bad, they're mostly hand-drawn reproductions of various currency so it's definitely good
for performances to children, but i'd be embarrassed to perform this for adults.
I've
looked up the materials needed and it does look like you could produce your own gimmick if you're
good with graphics software. I don't know how realistic it would look from a desktop printer though.
There may be a legal restriction as well, which is probably why they made the gimmicks the way they
did.
If you just want to see how it's done and want to play with the gimmick for ideas or
want something flashy and visual for a stage or TV show then i'd say go for it... but this isn't
terribly practical for walkaround or a bit of fun at the bar.