Consumer Reports didn't like Proform. I copied part of the article at
http://www.3fatchicks.com/forum/showthread.php?t=50314 If you are a member of Consumer Reports online, you can view their full report with ratings. But in a nutshell, the Proform machines frequently needed repairs. If you buy one, make sure you find out from them what happens if it needs repair. Do you have a local service center? If not, they may advise you to ship it off (shipping at your expense $$$) or they may just mail parts to you and walk you through the repair by phone.