I have two lowers with Geissele triggers - one with adjustable in DMR config and one SSA. My third lower has stock Colt trigger. I could easily live with stock, but I prefer Geissele. Total count is over 5000 so far without any major issues. The SSA went through MD Carbine II class, with attendant volume and rate of fire. The only little problem I had was trigger pin walk on DMR. Could've been to big of a hole on lower. Ended up using KNS pins which are not recommended to be used with adjustable Geissele but that was my only option.

