The old Proform 585 Treadmill and 585S Heart Control Proform Treadmill models didn't measure up to the company's standards. They were replaced by the Crosswalk designs and the more popular new 6.0GSX line.
According to reviews, these machines are just not reliable enough to warrant a test-run. If you are trying to get into a new fitness or cardio conditioning routine, you have to be able to trust your equipment. It is no use if break downs interrupt your fitness program continuously.
The old Proform 585 Treadmills and the Heart Control Proform 585S Treadmills are still popping up in classified advertisements. Remember that these come without any warranties. If you discover a problem, you will have no recourse. Replacement parts are still available, but the expense is probably not worth it.
These models are folding treadmills. They do offer a heart rate monitor, as well as convenient extras such as a water bottle holder. The incline level can be adjusted. The running surface is fairly well cushioned. The safety measures include a safety stop key. The Proform 585S Treadmill includes a two speed fan to keep you cool.
If you are serious about losing weight, rather opt for a 400E Crosswalk Treadmill with upper body workout arms. However, not one of these models have been manufactured for the serious marathon runner. They are more suitable for a moderate walker.
This brand and many other fitness equipment manufacturers now offer more reliable budget models at reasonable prices. Do your homework before you choose a refurbished Proform 585 Treadmill.