I have a Geissele trigger that I use in my MGI combo. While my experience is limited to stock triggers, the Jard trigger and the 15 minute job, I am absolutely in love with the Geissele. What arrived when I ordered it was remarkable. Serial numbered parts, a selection of wrenches and a slave pin. I was floored with a few of the additional items and a few things that arrived in the mail after the first package. I do not want to go into specific detail, as I am not sure if the extra goodies are standard, but if you are contemplating a quality trigger, I would heartily suggest that you contact Bill.
The trigger is built like a tank. It was extremely easy to set up (I had earmarked several hours after my JARD installation, but it took all of 15 minutes), and I have no fears regarding the adjustments. The nylon inserts and loctite should serve me well. While I have no quantitative way to measure lock speed and actual hammer force, I will relate this. When I do trigger work on my AR's, I spend a lot of time dry firing them once installed. My normal method is to use my thumb to catch the hammer on the lower (sans upper) while dry firing. I can do hundreds of these drills with my stock trigger or the Jard unit. With the Geissele, after about 50 cycles, my thumb was bruised and sore. A more quantitative way to prove the hammer force and lock time (speed) is the fact that his trigger works 100% with both my Ciener and M-261 kit, with no modifications to the units. It is fast and powerful, with a 1st and second stage that are beyond belief.
I cannot comment on long term use, or suitability for a SHTF weapon, but I can attest to the fact that it is a trigger of extremely high quality, and my experiences with Mr. Geissele confirm that his customer service is beyond reproach. A very class trigger, and class gentleman, worth every penny.
Craig