Just received mine! This trigger does look to be rugged by design, not much to break or loosen up.
ETA: I just finished installing the parts into a POF lower I am building up and I can say that this is a big improvement over the Timney I had before. I also had a Jewel 2 stage adjustable which while lighter in pull the Jewel just did not feel right for me. I can say that the Geissele has a strong hammer spring, it took a bit more to get the hammer in place and pinned than I am used to. I probably have a poor memory though, it has been a while since I have messed with AR stuff. I can say that this trigger has a better feel to it than anything else I have seen for an AR type, and the way it is built is simple and seems foolproof. I noticed that there is not any signifigant overtravel in the trigger after the hammer is released, I was a little concerned about this since there is no adjustment for overtravel. This trigger does not need any adjustable parts, and that is a good thing.