I got the Ken Onion version for Christmas. Was hesitant to use it on my brand new PM2 and Chaparral until I finally went for it yesterday. Previously practiced on all the kitchen knives and Cold Steel "collection".
As long as one follows the instructions and STOPS belt movement before the tip is ~1/2 way across the belt, the tip of the blade will remain pointy. I made just two passes with the 80 grit belt on my Spydies (angle set at 20 degrees per side) and then several passes with the other belts (skipped the 6000 grit, as I found it actually DULLED the other knives a bit).
It does put a nice clean "concave" edge on the blades, but not a the beautiful beveled edge that I see in so many photos here.....but I gotsta tell ya, I had NO idea what a "hair popping edge" was until last evening.....both of these Spydies make hair POP off my arm, effortlessly. Like a barbers straight razor! Per the manufacturer, the concave edge is supposed to be longer lasting?? It does carve through wood, plastic and cardboard with almost no effort, and I can still shave hair with both knives (CPM S30V and CTS-XHP).
I will likely still purchase a Sharpmaker some day, but I know from 50 years experience that I absolutely SUCK at getting any semblance of sharpness from any knife I've ever tried to sharpen on any "stone" or other knife sharpening contraption.
So, if you are like me, and can be sort of careful with power tools, I would recommend the Work Sharp, I am sold on the thing, for now.