Well i just got my Cooper M21 Varminter in .204 and so far with the 46 roudns I put through it, it hasn't shot anywhere near what its supposed to. But I have to give it another shot before I send it in to them to make things better.
I hear nothing but praise for their customer service...even on used like you got. So I have no real worries yet, and for the most part people love their rifles.