Tried the Geissele SD-C on Mrs. Wake's gun and it was pretty sweet! I tried the gun on a course of fire where we were doing multiple shots on various targets, so it was a nice "test run" for the trigger. The break was crisp and didn't feel like it was too light, as in venturing into being unsafe for defensive shooting, which was something I was concerned about going to 2-stage triggers. While I am not sure if the trigger allowed me to shoot faster than with a USGI trigger, but something I'd like to test in the future. See if there is a difference on split times.
I'm really looking forward to when my SSA comes in and shooting from a bench, where I hopefully can focus more on the trigger break itself.
When we were doing the walk back drill shooting on steel, I remember thinking I wish I had the Geissele trigger in there. It was one of the first times I really started noticing the slight gritty feeling of the Colt USGI trigger. I hadn't really noticed it before. I had heard of that as a common observation or complaint about USGI triggers, but I guess that was all I knew.
Overall, I do envision eventually trying the SD-C in another AR.