In truth, Proform Treadmills do receive positive feedback from many experts, but have just as many negative scores as well. Those who offer good feedback claim it has a sound and powerful motor and sturdy build, and that the control panel is easy to figure out.
However, seeing as the reviews seem to be fifty as far as their reliability, you definitely have to be leery of them, and epically when you remember you are only getting a paltry 90 day warranty.
There are simply are better treadmills out there that are higher quality and come with better warranty periods. In fact, the warranty is a good gauge of how confident a company is in their quality, and this extremely short warranty obviously shows lack of confidence on the companies part.