I have an Iron Man treadmill that I bought at Dick's Sporting Goods for half off several years ago. It's a $1000 treadmill that we got for $500. We thought, "hey, this is an expensive piece of equipment...should be great!" Wrong. I still have it five years later, but the belt slips on it about a five minutes into my workout, so I'm constantly wondering if I'm going to fall off (belt greaser helps, but not for long) and then after about 16 minutes of running at 5.5 or above, the thing starts to smell like smoke and turns off. So, I guess what I'm saying is steer clear of this brand. :) If you just want to walk, you can buy a mill for less and it'll be fine. Running is a different story. You tend to get what you pay for, I think.
Hope this helps!
Hilary