IIRC, PSA is using chrome lined FN manufactured barrels on some of their uppers. Those barrels are lined with chrome that's twice as thick as it needs to be. I'd call that a very usable barrel!
Not that I'm against the M&P Sport. If the OP likes them and can get one at a fair price, I'd call it a good option. But is it better than other entry level options? Probably better than some, but not all. One place that it does come out ahead is in availability. You can find one in most gun stores, take it home today, and have a useful AR style rifle immediately.
Contrast that with PSA - they make some rifles and I've seen a couple available, but mostly they're loved by those of us who want to assemble our own. They also are often out of stock, so you have to watch them and buy while what you want is available. No big deal for a guy who's just taking his time building a rifle his way anyhow, but it doesn't appeal to everyone.
Price is about equal on the two.
I really don't get all the deep-seated rivalry that comes out between AR guys. As long as good parts and a good upper end up on a mil-spec lower, the rifle is going to outlast me regardless of who stamped their name on it.
Another thing that chiltech500 may want to try... hang around at the local gun shop and see what shows up used. Let it be known that you're in the AR market. I know someone who did that and ended up scoring an almost new Armalite midlength for just a little more than an M&P Sport. He's very happy with the purchase and it's probably got more resale value if he ever tires of it. Just a thought.