end mill grinding

Hello has any body got any experiance with the tool grinding fixture from J & L stock No atifx-350048 its a fixture for grinding end mills slot drills on the flutes as well as the ends from 3/16" - 1 1/4" dia on a surface grinder, have you bought one and thought that was a waste of money or are they the best thing since sliced bread when you don't have the space for both surface & tool & cutter grinding machines or do they take a lot of setting up do get good results because with the price of regrinds today it would'nt tale long to pay for itself Cheers Colin