RRA's have a very nice trigger, and the lowers are fairly nice, although the castle nut usually isn't staked. As far as uppers go, if you're looking for an all-around carbine, you could probably get more for your money with BCM or somesuch. You can order a chrome lined barrel from RRA as a factory option on some models (or at least you used to be able to a couple of years ago), and you can get a 5.56x45mm chamber, but they didn't do a very good job staking the gas key screws on mine, and I had to have that done myself. RRA's default barrel profile is rather heavy, which is good if that's what you want, but be aware of it.
On the upside, fit and finish is usually quite good, and they tend to be quite accurate.
I like mine, but I think if I were going to do it over again, I'd probably get a BCM 16" midlength and drop in an aftermarket trigger, RRA or otherwise.