I’ve been using one after workouts using the recovery program, usually on my quads but calf’s as well sometimes.
I’ve nothing to compare it with but haven’t been waking with sore legs the day after tough workouts.
Regarding pad life I think it’s quite personal. I’m still on my first set and have used them 30+ times and they’re still nice and sticky. My wife has her own pads but shares my PowerDot device and after only a couple of uses on her shoulders/neck and I’m noticing they’re not sticking very well. I think it really does depend on your skin type, I’m also post workout shower when ever I use mine which I think helps.