I'm not an AR expert but I have put together a couple, and shot them quite a bit over the last few years. Both came from Palmetto State Armory. Both of mine were built from parts kits/stripped lowers/complete uppers. First, I'd say consider building one with a kit and stripped lower. Easy, fun, and you'll know how it all works when you're done. Plus you can save money and get exactly what you want.

I've shot both S&W and Ruger ARs and have friends that have owned a few examples. They are functional and all around decent rifles. The price you found looks good.

But I think you can do better for the same cost, or even less. If I wanted an all around good shooting rifle (not for competition or to carry into combat) and didn't want to build it, I would buy this complete upper https://palmettostatearmory.com/psa-16-5-56-nato-1-7-nit-13-5-mlok-w-nibr-bcg-mbus-ss.html
and complete lower https://palmettostatearmory.com/psa...-edition-odg-no-magazine-5165457977.html
and stick them together.

Total cost $450, free shipping, everything except mags and ammo. There are MANY more options and infinite ways to configure if you build yourself. Just an FYI that upper has a light contour "pencil" barrel, which you might want or not, but it comes with some nice components at a great price.