my experience with the flexbelt was as follows. When I first received it, I had it on low,,, for starters,,, then eventually increased the power level, the more I increased it, the more uncomfortable it got which I was able to tolerate but I noticed that the pads would not last as long on a higher input. I found myself going through a set of pads every 5 or 6 days, at $22.00 per set ! The very first set of pads, which came with the unit itself seemed to be extremely thick with gel as opposed to the secondary sets which I ordered afterwards. Bottom line is, the flexbelt does work but in my experience, it is very expensive to operate and it is not advertised properly. The manufacturer should indicate that once bought, you are now at their mercy for weekly pads at a substantial price.