Yup, Geissele is hard to beat for a drop in.A good question that I'm sure you'll get several good answers. I've tried several; the RR match, American Gold, Jard, and now the Geisseliee ...whatever, the G word trigger. I think it's the best of all of them for just a pure drop in, no adjusting just shoot it trigger. It's a lot like the RR only more refined. You won't have any problems with it and it will make shooting your 308 a lot more fun and accurate.
I just put a Geissele SSA-E on my LR-308, and love it!