Thought I posted here last night,but I didn't get it posted intime before they shut down and forgot to get back to you..
Yes I have been using one on my grinder and one on my metal cutting bandsaw for a couple of years now,they work great..
I had some trouble with the circuit board on one and found that a couple of the conetiond on the board had come loose so I re-soldered them and have no more trouble..I also found that they work better for grinding and cutting if you will btpass the in line fuse.Mine were making the motor and board over heat and also kept blowing the fuse,since eliminating this I also have had no more trouble.They don't want to be dogged on real hard so keep this in mind when grinding..I have quit using the pantyhose over the ends also,I just keep it blown out and have been running it this way for over a year like this with no problems..The shaft is metric so you may need to check this before ordering your disk or else find a shim to fit it and the disk ..
You will love it as a variable speed grinder motor if you dont have one already or never used a variable speed grinder before..
Good Luck,
Bruce