I hope they never stop making this.
This thing is BY FAR the BEST callus remover I've ever tried. I've had ones where they used gears to have the wheel rolling perpendicular to the motors... and those will eventually skips over time when the plastic wears out. This thing however would have the disk mounted directly on the motor's axle itself. I've only had it for a few days, but I'm very happy with it.  I am a bench jeweler, and I use a lot of chemical compounds that eats into my hands, resulting a lot of callus on my fingers. This thing shaved all that callus away in minutes.
Rating: 5 stars