I splurged for a County Logic girth a few months ago and LOVE it. I started looking into anatomically shaped girths because my horse's girth groove sits a little forward of where a straight girth falls. I tried the Prestige Anatomic Dressage Girth first, but found that the keepers were a little too far down and the billets weren't making it far enough into them to be kept in place; that would be OK for a cheap girth, but not when I'm spending that much.
I'm sure it's not entirely because of the girth alone, but my horse was quite girthy when I first got the Logic. Since then he's gotten less and less girthy until a few weeks ago I noticed he wasn't girthy at all anymore!