I know the XCR trigger is known to improve over time, which is good. The one time I have had the opportunity to shoot an XCR so far, I thought that the trigger felt much like the standard semi-auto trigger on an AR, which for me is fine for what it is. Is it reasonable, and also, is it reliable? That is a key point. In the AR15 world, there are certainly nice match triggers available, but they are not as reliable as the standard trigger.
The RRA two stage match trigger is supposed to be better feeling than the standard trigger, and just as reliable. You still hear reports of them going down from time to time though. Not so with the stadard single stage. All my ARs have standard triggers. They are not match rifles.
I went shooting with a buddy I haven't seen in a while yesterday. He is building an AR for highpower competition, and has the lower all set up, but the upper hasn't come in yet. We paired my upper with his lower and took a few shots. The trigger is a Gesille (not sure how that is spelled) adjustable weight, set to about 3lb I think. Was it nice? Sure. Will it make anyone shoot much better with that upper? I doubt it. Its a milspec upper. I'll take the reliability on non-match guns.
Also, looking at the internal diagram of the XCR lower, the trigger and disconnector look *very* similar to an AR's standard parts. I'm sure it is quite possible to take them out and hit the contact surfaces with some 600 grit sandpaper or something, and expedite the break in process yourself.
As long as my XCR's trigger doesn't come as something worse than a stadard AR's, I'll certainly be happy for now. If and when a match trigger is released, I'll wait for a few field reports before buying that as well. At best it will be 3rd or 4th on my wishlist of XCR add-ons after the base rifle comes in.