For what it's worth, I've had a D. Boone for about a year. I had heard of warpage issues with grease pan and lid fit. I discussed with my dealer and I was assured ANY problem would be taken care of. Now I've been fortunate in that knock on wood I've been spared problems except out of the gate my low-pellet alarm failed and was replaced in 3 days. I have no warpage on grease pan, but I've always used the wind deflectors. My lid, yes it's thin, but it has not changed since it was new. There is maybe 1/4" gap at the hinges, but snug everywhere else. I've used this grill plenty at high heat, pulling out pizzas, bread , and the occasional steak seared on Grill Grates. The controller is exceptionally good and no issues there. So my two cents is the fact this grill is made in China, means it has Chinese-made steel. Which varies in quality on a daily basis, much like the stock market varies. I lucked out I guess, my steel was a good batch....maybe?
If I had to do it all over, I'm not sure I'd rebuy this Boone, but I am happy with it's performance to date. No beefs there. But it was not built to last a lifetime, and it won't.