Their prices are competitive and you will get an AR that will be extremely accurate. Check out their parts like barrels. I bought one of their complete uppers and this is how it shot right out of the box with my last years hunting load. Sierra 65 grain Game Kings at 100 yards. 5 shot group.
gt40
: This is the one I bought with 1 in 7" twist for $610 plus $100 for fluting.
I built one for $450 from PSA but I splurged on a couple parts which ran the price up some. No way I could have come out for $353 though! That is a smoking deal!
I like to visit the online retailers a few months before and around the holidays starting at Thanksgiving. See what the normal prices are and then go back and visit for their holiday sales and compare. I've built several quality guns for lower end prices (not including optics). Gunbroker is always a good tool if your money isn't burning a whole in your pocket. I've bought guns from them this year at close to wholesale pricing. I know this because my FFL shows me what he pays for them.
Best advice is to be patient and learn to build and assemble the gun yourself. It may be a $700-$900 gun but you'd be amazed at the quality parts you can find on sale and overtime build an amazing weapon.
Got a CMC flat 3.5 single stage trigger from JoeBob for $130 other day.
Not really AR specific but ordered a low-end 1x4 Sightmark scope for my beater AR @ $150 from Centerfire systems. Couldn't find it for anything less than $200 on the rest of the internets. Didn't pay much so don't expect much, but the reviews are pretty decent.