I have used the Worksharp 3000 to shape my mortise chisels. These are the oval bolstered type chisels, so they have a serious body thickness to them. I would sharpen them to 30 degrees and maybe even put a small micro bevel on the edge, although I am not generally a fan of microbevels (when you resharpen, you either sharpen on the minute microbevel or you have to regrind the bevel). Actually, I first rough shape the bevels on a belt sander (I use the Norton blue zirconia paper) so that I do not have to hog off a lot on the Worksharp. The quality of the bevel on the Worksharp is astounding. (BTW, I bought extra glass plates so that I could have the same grit on both sides. This allows me to work the bevel and to flatten the back of chisels with the same grit at the same time).
I have also sharpened the existing bevels on mortise chisels using a medium diamond stone, then following with my 800, 1200 and 4000 grit waterstones. I hold the chisel freehand, which works well since the bevel is so large. On the diamond stone I push the blade forward to shape it, but on the waterstones, I drag the blade back, to keep from putting a serious gouge in the stones.