Cons: Poor construction quality. Weak motor.
After years of neglect, I decided to start exercising again for all the standard reasons - health, appearance, increased energy, etc. I did not know much about treadmills but had seen ProForm models at Sears and Sports Authority. I decided on the CrossWalk MX based on price and the added benefit of arm motion.
Six months later, I am a much more informed treadmill user and I wish I had opted for a higher quality, more expensive model from a specialized fitness equipment dealer. The ProForm treadmill has already started falling apart. Plastic parts on the undercarriage have broken off while moving it between rooms, the belt slips, and the motor starts very slow regardless of the speed setting. I also found that as my fitness improved and my speed increased, the Crosswalk was not stable enough.
I am a large person and weigh approximately 225 lbs. I was closer to 250 when I started working out. This unit is clearly not built for someone my size. I did not understand this when I bought it. At this point, it has proven to be a disposable appliance.
There are entry level treadmills from manufacturers such as Smooth that would have been a far better investment. Avoid the ProForm models and start with something that has a chance of lasting longer and accomodating you as your fitness level increases. There is a lot of good information and equipment reviews on www.treadmilldoctor.com. I strongly recommend using epinions.com and Treadmill Doctor for research before buying.