Quoted:
You're gonna love it! Problem is, if you have multiple ARs, now you will have to get one for all of your guns.
This. Say goodbye to all your current triggers.
I have 2 SSA's, and just got an S3G, which is the SHIZ! I LOVE the S3G.
I have two other AR's - one has a Wilson TTU, which is a great drop-in trigger. The other is an Accuracy Speaks trigger, which is OK, but I don't believe it's as robust as the Geisseles.
That's the thing about Geisseles - they perform great, and I believe them to be as sturdy as the USGI crap triggers that come in any standard LPK.