I'm no expert but from checking it out on the internet this appears to be a good grinder. I believe it has a reversible motor so it can grind in either direction. Check that out for yourself though.
Personally if this is in good shape I would be comfortable with the price.
I met up with the guy earlier today. Offered him a $100 bill but we settled at $120. Do these sharpeners use different size stones for different size chains? Is there anything else I will need when I get this thing up and going?
Get two CBN wheels if you are doing a lot of chains.
One for 1/4,3/8lP,.325 and another for 3/8&404
Or get another grinder. Lol
Keep the CBN wheel dressed with a white stick.
If it's not flat and dull looking......dress it.