I have one of the standard TTUs. It's really light and crisp (4 lb). I almost wish I would have gotten the LE version that has a 1-1.5 lbs heavier pull.
Very short travel and and reset in general. I don't have experience with the Geissele trigger, just the standard GI parts trigger. I like the TTU much more and am glad I got it.
Depending on your needs the standard TTU or TTU LE are nice choices though. I got mine during their recent Christmas sale so I didn't have a choice, but I really like this trigger.
