I have owned several treadmills over the years. Some were better than others. It kind of depends on what features are most important to you (display readings, incline levels either auto or manual, speed settings, pre-programmed workouts, heartrate readings, calories/fat calories readings, etc.) and what your budget can afford. As Boss Man says...alot of pointless stats can get in the way sometimes and be misleading. A good cushioned deck is important for impact absorption, the wider the running area the better.
I bought a used Reebok 4x 4000 (from a friend) 8 years ago and it is still going strong, with only one malfunction (incline quit about 1 year ago). I have logged literally thousands of miles on that treadmill in 8 years. I have the i.fit capabilities but have never used it, and mine has pre-programmed workout levels (I also rarely used those, prefer to just get on the thing and run!)
So, I guess it all depends on what features you want (and will use) and budget. You might do some research online, check out some discount sports websites for closeouts or discontinued models for some good deals.
Good luck to ya!