I have had the Proform 330X treadmill for many many years(estimated 8 years). I would say that it has outlived the life a treadmill would be expected to have. It folds up for easy moving, but isn't made of flimsy materials. It is very sturdy; you can run on it without feeling like it's going to fall apart under your feet. I use it four to five times a week, 50 minutes each workout. It keeps a rough count of how many calories you have burned and also has a heart rate monitor. The speeds are right on, even after this many years. It has nice side bars that you can hold onto while your walking if need be. It has a timer on it to keep track of your workout time and also tells you how far you have walked/ran. I've never had any problems with it; never had to replace parts or call in a repairman, thankfully! I would highly reccomend the Proform 330X treadmill to my friends and family, anyone who is looking into purchasing a treadmill that will last them a long time.