I have trouble trusting treadmilldoctor reviews, since they are all basically 3 or 4 lines of comments, most of which are just of the "insert generic comment here" type. You would think if he had real reviews and data to support his numbers, you would see more proof that some effort went into his reviews.
As for this model, the features are good for the price, for the casual to moderate exerciser, especially considering no tax or outrageous delivery fee for most. 12 mph is more than fast enough unless you are a competition sprinter, and better than most in this price range, which are 10. I would bet most people stay between 4-6mph. But IT HAS NO FAN. So either bring your own, or don't sweat.
I have a different proform model, and it's been fine so far. The only issue is I would have liked more cushioning on it, so make sure that is not an issue for you before buying one you can't try out first. In my experience, the treadmills with higher weight ratings (like this one on woot at 350lbs) have sturdier wooden boards, which is good for fat people, but worse for your knees. Cheaper treadmills might have thinner boards and break easier, but they have more flex when you run.