FRJ, it stands for Work Sharp. It is a motor / small belt drive system. I have about every system, known to man, for sharpening. I like stones and strop for "maintaining" an edge. I use the WS for getting an edge, pretty fast, on a knife that won't cut butter.
Tundraman, the detractors will tell you that running it too fast, will generate heat and ruin the heat treat on the blade. I generally use it at medium-to-slow speeds. It will
put a good edge on knives, with practice. It's not too hard; I too watched Youtube vids. I had an assistant, that I swear she tried to sharpen her kitchen knives, on the asphalt, on her street... butter knifes literally cut better and they had scratches that will never come out. I knocked out all of her knives in very little time with the WS. It would have taken me a week to get her knives back in shape, with stones. (She cut herself within a week of me sharpening them)
I just recommend starting with the least favorite knife...that wouldn't hurt to mess up. I never run it on high speed and don't use it on my traditional folder pocket knives...the blades are usually thin enough, I can get a good edge with stones, pretty quickly. I prefer stones, to maintain...because the WS potentially removes a lot more metal. I did pick up a leather belt, that is pretty good for stropping...I use some compound on it. Don't try to strop with the cutting edge toward the belt...you have to do one side out of the aligning guide.