I have never dealt with them, I have seen their web site,
their cannons look to be a little on the crude side,
without actually seeing one it's hard to say as to quality,
most improtantly ask him what type of steel liner is in the casting?
is it a seamless liner & how thick?
How is the liner breeched?
is it shrunk and welded or just welded?
is the cannon cast around the liner or is it bored and inserted?
what type of prices is he giving you?
how big a cannon are you looking for ?
have you checked some of the sponsors here at the site?