I'm looking to buy my first ceramic cooker soon, and have been doing alot of research on the various ones available. From what I've read, as far as cooking, you can't go wrong with almost any of them, they will all cook comparatively (assuming all else is equal with regard to the ability of the cook).
Some of the grills have slightly better features than the others, but in general, these seem like minor differences.
It seems to me that the biggest issue would be local availability and customer service. If/when your firebox cracks 5 years from now, you want to be sure that there is a company out there to support you, and that spares are available.
From what I've read, the BGE and Primo should be of no concern with regard to future warranty work. I believe that both companies will be around 5, 10 years from now.
I worry a little about the grill dome.
Sorry about your luck, if you haven't already contact TK at Grill Dome, he would be more then happy to take care of your problems.
I've seen lots of posts on the grilldome forum regarding contacting TK. And, it sounds like he does provide good service. However, all of these references to TK suggest to me that grilldome is essentially a one man company. That worries me a little with regard to future. What happens when TK is no longer there?
It's too bad, because I like a lot of the features of the grilldome (bigger dome, stainless hardware, available in RED, slightly lower cost) better than the BGE.
Locally, I have several BGE dealers in the vicinity (one within walking distance of my home), and I suspect that I will wind up with a BGE. Not because it's "better", but because I believe that I will be served better than the competition in my area.
Good luck with your decision. I hope I will be back soon with a new ceramic cooker.