I like the idea, but I don´t see all the applications it claims to have.
Anyway, the fish production is great, and I use it in every show.
I´ve seen some reviews that claim that the Kozuch is too big, but I assure you that it is not. If used while holding a glass of water, it´s completely invisible.

I like the Kozuch. It's not what I was expecting, but that's magic for you. The only thing that the description doesn't tell you is that the gimmick is strictly for the use of a cup or glass.
But, It can be done surrounded and sleeveless, holds a decently sized fish, and you really don't need very big hands. You just need to play around with it and find your sweet spot (unless you're like ten in which case, your hands might be too small :p)

I thought it looked like something I'd probably use but since I bought it I haven't even used it for anything because the gimmick is unreliable and requires fairly big hands to hide the gimmick so if you want to get it you can but be warned that it will most likely collect dust.