I have the Delta VS grinder with an 80 grit CBN wheel and a 220 grit diamond wheel with a wolverine jig and the guards removed. I'm very pleased with how it works.
I recently added a Tormek BGM100 bench grinding jig that is mounted to the right of the wolverine jig and elevated so it is parallel to the center of the wheel. I opted for this setup over the wolverine adapter jig because the ergonomics are better for grinding knives, planer blades, and plane irons. Its also easier to adjust the BGM100 exactly parallel to the wheel and I can always add a wolverine adapter jig at a later time. I hardly ever use my Tormek anymore and will probably add a second BGM100 for the 80 grit wheel on the left.
I recently picked up a 1 hp 1725 RPM Milwaukee grinder at a school auction and am considering switching grinders because it is wider and will allow me to sharpen 15" planer blades without the end of the blade hitting the other wheel. I'm also looking at the possibility of adding a speed control to the grinder. The speed control listed below is for brush type motors and I'm not sure if will work with a grinder.
http://www.rockler.com/router-speed-control