Only time will tell; however, so far so good! Purchased to attempt to ease the soreness and swelling from my fused ankle and foot- used it last night prior to bed and woke up with less swelling.
I have used a couple of the program modes. Mostly I leave it at 15 minutes and turn it up to 99. It is very sturdy. The weight limit on mine is 330lb. At 6'4" 240lbs I didn't want to max out a lighter model that was rated at 260lbs.
I have only had it about a month. It seems well built. I feel comfortable with the durability at this point