I bought a GMG DB about 7 years ago for $499. No Wi-fi. I think that for the price point, and for a complete newbie to smoking, it was a fantastic purchase.
I had a few issues, but customer service was absolutely top notch. I have purchased a Godke's Downdraft and I have expanded the notches on the heat shield so I can move it around a bit more. I also built two racks to increase cooking area. My main issue with the unit is temp control and hot spots. Front right corner runs very hot in comparison to the rest of the pit. Sometimes 40-50 degrees. I received a Fireboard for Father's day last year and I keep tabs on pit/meat temps that way. That being said, I have learned to cook with it, and it has put out some tasty grub.
I live in a mild climate, with no major temp swings during the year. I keep a cover on it, and clean it out after two or three cooks. No rust, no breaking points, all parts working well.
All things considered, I would definitely recommend one to somebody looking for a pellet grill.