I thought it looked intriguing. The Feed sent an ad to it, and that looks far better than that rolling around on the ground on top of a foam cylinder. I'm considering it, but have no experience with it.
On the downside you can’t do both legs at once. Also, doesn’t look like you could do your back at all.
__________________
See, this is why we can't have nice things. - - smarkinson
Where else but the internet can a bunch of cyclists go and be the tough guy? - - jdon