Going off discogs for a purchase

About to pull the trigger on one of my grails—a $200+ record. The seller and I negotiated down to $160 flat, but it's off Discogs. I've never bought anything off-site before, and while the seller has a perfect 100% feedback rating, I'm still hesitant.

Should I go through with it? Have any of you bought off-site before? How did it turn out?