I have a number of Geissele triggers. They are really nice and have been extremely reliable and durable. If you want curved trigger I would look at the High Speed National Match or SSA-E. If you like flat face then check out SD-E. All 3 smooth 2 stage triggers.
Yep and there's very discernible difference between 'em too. I probably have one of every AR trigger they make I guess and they're all great. They're all I use in 'em and have been for a while now.
Hi-Speed is best all around, period. I put one in a tack driving Grendel and one in an SR25. The trigger is peerless. The set screws can be permanently set if you like but they've never come lose on me, which is the usual reason why it's not used more (or rather the usual concern). Never seen it happen though.
SSA-E is similar to Hi-Speed in feel when setup with the DMR springs IIRC, and SSA is a bit heavier. Between these you'd probably want the SSA-E. I mostly have these, this trigger is nice if don't need the adj. feature or don't want it, or if you require a failsafe setup. SSA is the SSF without the full auto feature BTW.
I have an SSA-E SD in a Noveske, it's pretty nice actually and I wouldn't have bought it otherwise so it was a nice surprise. Depending on where you contact the trigger affects the pull quite a bit too.
FWIW, if you have something "fast" the 3GSD is damn near impossible to beat. The flat bow on a 3G trigger is just the titties. Too fast, too light, too quick to use for slow squeeze precision really (it'll probably double if you try).
Unless you need it now, keep an eye peeled on Brownells, they put 'em on sale a few times a year and you can get 'em 20 or 30% off even.
Oh, Brownell's contracts one from them that's actually really nice, I have the single stage versions but they make a 2 stage. Only two differences is 1. it uses a spring vs. pin to retain it (it's actually more positive than standard) and 2. they're not individually engraved so I think QC is by lot. Otherwise the same thing really. Can be had for a lot less, especially when they go on sale. Best bang for the buck for a quality AR trigger.