legi0n
I have read some replies on the cast bullet website and they seem to be liked but are slow.
It is cheaper to make your own gas checks for sure but time consuming.
The second most talked about thing on them is what material to use beer and pop cans are a little on the thin side, they do work but not as well as a heaviere gauge metal.
I would probably try one but if I bought one then the next thing I would have twenty of them and ..................
Ken.