Just another variation of the BGE. There are lots out there, at many different price ranges. IMO, the difference is the quality of materials used, and the customer support. I think you can go cheaper than a BGE if you are a do it yourselfer, I preferred the piece of mind. BTW, the Primo is an awesome kamado grill too, I wouldn't mind having one.
go BGE or Argentine
I have a big green egg mini I use almost daily and one day last week three times in same day. I love it. Lots of accessories and support for eggs. I am getting an xl big green egg in the next two months. I spend some time on the egg forums. I am a believer and drank the big green egg koolaid.
I have two Big Green Eggs (large and mini). They are used at least weekly and usually 2-3 times a week. I highly reccomend them. I have heard good things about Primo, but purchased BGE's because there was a local dealer. They are expensive, but well worth it.
At $900 you might as well get a large BGE, a Primos (oval or round) or if you live in the SE US you might want to look at Grill Dome.
Yeah, the ones "on sale" at Crappy Tire are quite poorly made, Chinese kamado knock-offs. Typical OMC. I have no idea about the casting material, but if you're going to spend that kind of coin on a metal grill (the Broil King is a Bubba clone) you might as well just get a Weber. The Broil King's accessories are really flimsy, stamped chromed steel and plastic. If you're looking for a kamado, get one in ceramic or refractory material. Heavy, but that's the whole point.
For that price pass and get an Egg. You will not regret it!