The S&W is probably the best of the cheaper AR pattern rifles. But I do think that something like a DD, Noveske, or BCM is worth the extra money if you're willing to spend it. If you're looking for something that is dead nuts reliable, mil-spec, and geared for and can take hard use. Then that's what you want.
If you want something that is still good quality but will be shot a few hundred rounds, every few months at the range. Then the S&W is a great choice.
The S&W is better overall than say a Bushmaster, DPMS, STAG, etc.
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DD does also make their own lowers, not sure on uppers. As well as some if not all small parts and barrels. DD is one of the best out there.
Edit. Here's an article. They do indeed make their own uppers and lowers.
http://www.tactical-life.com/online/guns-and-weapons/daniel-defense-m4-xv-ez-556mm/
