Pros: Higher grade steel for the price range, smokestack in proper position, built in deflection plate, extra heavy duty racks
Cons: Welds and seams may not be quality controlled that well, some gaps.
I just got the Oklahoma Joe Longhorn and love it... scored a deal and got a floor model for $300. But I had a little buyers remorse when I saw the Old Country Pecos at Academy. It's in the same price range as the Longhorn, but its metal is much thicker, its smokestack is in the right spot, and it already has a deflection plate welded inside (I will need to spend near $100 for an diffuser plate set mod for the Longhorn - although that set is a much better design than the plate in the Old Country Pecos to be fair).
I still love the OK Joe, but I do wish it had the extra racks inside that the Pecos has, or the thicker metal. If I don't go to a Yoder after this, I could see going cheaper and getting an Old Country and modding it out. It seems more than enough for the enthusiast, medium-level smoker, but definitely not in the big leagues, nor is it entry level. You can't argue with $400 getting you a ready to go, off the rack option, that can still be improved. I think the OK Joe Longhorn fails here because I think you at minimum need to mod the smokestack location issue with dryer vent tubing before its passable (good news is this is cheap and easy, but may cost you a few sq.in. of cook space you should have had if they just mounted the smokestack lower - a really annoying oversight for an otherwise really nice bang-for-the-buck smoker).
This is all from an eyeball examination, so I can't claim any hands on experience beyond that. I'd just say its worth a look before you pull the trigger on something else in the $300-$600 price range.
One note, even the Longhorn was a heavy beast to get home. The Pecos is probably way worse. So if you think you are going to run out to Academy Sports and just tie it to the roof of your car, think again. Hopefully you know some strong buddies to help haul this sucker home, preferably with a pickup or trailer.