They've gotten a lot better but I think they're still around $750-$1000 and for a little more you can get a better rifle.
If I were going to but an AR-10 and only had that much to spend I'd just get the Smith & Wesson M&P 10.
This one is a good deal. You get a better lower & upper receiver, better bolt carrier group, and better barrel than the PSA plus you can upgrade to a free float rail from someone like Centurion Arms for ~$200 and get a barrel from Criterion for ~$300 and have a great rifle for around $1500 once everything is done.
Ignore the "out of stock, no backorder" message because they get them in pretty frequently.
They're not too bad but I'd recommend looking into Aero Precision or slowly building one yourself using LMT parts.
With an AR-10 you're better off getting something pre built and of good quality since they can be finicky. I'd probably get a Daniel Defense/LMT/Knight's Armament if I were going gas impingement or get a HK MR-762 and be done with it and not have to worry about much ever again.
You could also get a Smith & Wesson M&P 10 for not much more than the PSA and it is a better rifle out of the box, especially if you get the "Performance Center" package or whatever it is called.
Swap out the barrel for a stainless steel Criterion barrel and put a Geissele SSA-E trigger in it plus a good optic ($1,500+ and something like a 3-15x for a .308/6.5cm) and you'd have a nice mid range setup.
Also, some of the HK G3 replicas and FAL replicas aren't too bad either.
They're pretty reliable and almost as accurate as an AR-10 style rifle. Some get 1-2moa with good ammo (sometimes less but it is rare) and 2-3 moa with bulk ammo.
If you can catch the match grade .308 on sale you can get it for ~$1.25 a round while the bulk brass stuff is between $0.75 and $1.00 per round which makes it a no brainer to go ahead and get match grade .308.
If 6.5cm ever comes down to .308 prices then I think I'd rather have that, ignoring parts commonality and ammo popularity in a SHTF situation that is.