The Pro 500 has been around since 1992 and there are around 35k of them worldwide. By clamping in the boot into the alpine binding, you can quickly and easily rotate a ski from one edge to base to the other edge. Like anything, some people don't like the vise and prefer others. I've had no issues regarding sturdiness for edge work or waxing/scraping. I did find that without a second boot it can get a little old swapping the boot dummy between skis while performing multiple tasks and switches.