Another Oly bashing thread...what fun. Oly makes 2 things great: their lowers and their SUM barrels. I have a T3MX lower and I will say hands down the finish is BETTER than the finish on my RRA upper. Everything was to spec, the coating is very hard, and there it fits very tight with my upper. They do outsource quite a bit of their parts. A lot of their lower small parts, their sights, etc. are outsourced. Not to say this is all that bad, but the quality isn't as great as their in house stuff. That said, so does almost every other manufacturer. The only thing I've had to send back was my front sight which didn't want to flip down. I just put it in a priority mail envelope, sent it off, and had a new one a week later. I'm sure if I asked to have my shipping costs refunded they would have, but I didn't feel like bitching about $3.85. So, my advice, go with Oly for the lower receiver because their quality is on par with anything else out there. As for the rest, it's entierly up to you. Oly's fine, RRA, Armalite, BM, etc. they're all pretty much on par with each other. Pick which ever one you want and I'm sure you'll be happy with it.