I've had mine since 1990. About a year ago the black tread started to lift in the areas around the step logo on both sides. My step aerobics intensity kicked up notch when I discovered Cathe so I'm not sure if my step would have lasted as long had I been using Cathe from day one. But it has been used consistently by my DH and myself for all of these years, so it's quite sturdy.
The tread has lifted quite a bit more and I have considered buying duct tape to flatten it again. I was wondering if it would make the step slippery in those areas when I really start to sweat. But I see someone else has done it so I'll give it a try.
Back when I got my step from "1 800 say step" (it wasn't in stores back then) it came with a lifetime guarantee but the company, I believe, is different now. With all of the punishment it's taken over the past 17 years, getting a free replacement wouldn't feel right to me anyway. If you take care of your step, it will last a long long time. :7