I have not bought one and do not plan to.
My personal thought is that
1) it seems complicated for something as simple as downsizing a pellet
2) the skirt diameter hardly matters, being so thin and with little bore contact, so the primary value of resizing is adjusting the head diameter.
3) I really like that they’re building a quality tool. I don’t know of many shooters who have had great luck with resizing so at that level of investment will it catch on? I hope the lead-in and bore smoothness is really good.
4) when it comes to resizing pellets I’m a believer in making sure the skirt is a few thousandths wider than the head. So while this certainly accomplishes the job I don’t see how this is an improvement over a tapered-bore resizing tool that would otherwise fit in a pocket of your range bag.