Not a bad deal but not a great deal either. We would keep walking to another model if you get interested by some of the cool features. They also have models that have a respectable level of quality built into them but this model isn't it.
At it's list price, it isn't much of a deal. At $599 it is not a bad walker's treadmill if you are going to treat it gently. If you have a need for reliability, put a couple hundred with it and you can get a much better treadmill. Even the Reebok model for $700 at Sam's Club is an exceptionally better deal than this one.