First: this sounds neat, but it makes me wonder if it is so low in maintenance as the makers claim.
Second: that swimmer in the animation! Would it kill them to add some frames to make the cycle look good? That poor swimmer will die of the single stroke they are making him go forever, make it stop!!.
My parents have one and seem quite pleased with it. They’ve had it for a couple of years now, they got it to help improve bone density something or other. They use it every day. Don’t know about the maintenance, but I could ask if you’d like. Email is in my profile.