Seems to work okay. Sometimes it feels as though it is a bit uneven when shaking when using the programs. It seems to happen around level 40 to 50. Also, the rubber was peeling up on a few areas but I put a weight there for a day and it seems to be reattached. I am unsure if the vibration is doing anything for my health but the product does vibrate.
The eagerness I have to even just stand on my (vibrating) rumblex is helping me to exercise more. I tell myself it's not a big deal, just stand there (even if I don't necessarily feel like it) and I'll be getting benefits (increased lymphatic circulation, etc.). But I usually pick up a couple of free weights and stretch and lift them a little bit too, but I tell myself I don't even have to, it's a bonus "extra". Ten minutes goes SO surprisingly fast I really feel like I easily have time for that once or twice a day.