Well I bought one because I opened a repair shop, I bought mine after I had looked at several, I went with the one that a
magnet strong enough to hold up a 33" snapper blade.
When I went to work at the big shop in Louisville, the owner and all of the techs snickered when I mounted it above my tool
bench. I would have mounted it above the blade grinding station, but I thought "Screw em'"....
Within a few weeks, the techs were coming and asking if they could check their balance, and I would let them....
As I said before, their idea of a valve grinding tool was a drill press and a piece of sandpaper........................