I read some of the comments in SteveHoffman.tv and my eyes glazed over after 20 pages. I have good ears, but not good enough to tell major differences in releases. I listen for pleasure and not to nitpick. As long as the vinyl is clean, flat, quiet, and does not cause any undo ear pain, I am generally happy.
And yes, I would only buy from a place that allows returns if the vinyl has issues like warps or bubbles.