I have had a Traeger "Texas" Model 075 (probably the one they had for $629) for about 2 months and have, I think, 4 cooks on it, including one cook of 8 Boston Butts for BBQ for a company picnic.
Another was a cook of two butts, a packer brisket and two slabs of ribs for a BBQ sampler platter for some of my friends.
Each cook turned out great. The temps were nice and steady, the smoke flavor from the pellets was light and sweet and I'm very happy with the smoker and the results.
I have heard the complaints that the quality of the smokers declined when production was shipped overseas, and perhaps that is true. I do not have a baseline for comparison. I've read on the Pelletheads forum about people who have reported problems related to construction. However, so far, so good here. I clean out the pellet ash after every cook with a shop vac, and I clean the outside of the cooker with Greased Lightning after each cook as well. I also remove any unused pellets so they don't pick up moisture. I also cover the grill after each cook.
As with any cooker, time will tell, but 4 cooks in, I'm a fan. I will say this - I got an even better deal on my cooker than what you saw them being sold for. I would be happy with the cooker even if I had paid full price, but I'm happier since I paid half price!
Check out the Pelletheads forum - you'll see a lot of comments - pro and con - about the Traeger. As with all other amateur reviewers - I discount both the good and bad then make my own decisions.
Pat