I've used the fine and UF grits for a few years and finally had the chance to use a medium grit 2x8" stone.
I believe if you want a great set of sharpening stone to sharpen your pocket knives or kitchen knives or about any knife in your house you need look no further for sharpening tools than Spyderco. The medium stone produces a great toothy edge if you want one and the fine grit is a nice smoother edge. Those two stones are all that anyone needs. If you want a more refined edge the UF is a great stone but not needed at all for the average person. Also, the finer the grit the higher the skill needs to be. That is my opinion based on my skill level changes in the past 3 years. The only time anyone needs to step outside the Spyderco selection is for coarser grits. I use DMT stones for them but there are lots of other choices. Some cheaper, some more expensive. I'll stick with the diamond stones for now myself.
The medium stone I have at my house is a loaner. I may or may not get one. My needs for that grit range are covered but the medium Spyderco does such a great job I just want one. I'll probably have one sooner or later. May search ebay for semi-used ones. Who knows? No me, that's for sure.
So, if anyone is struggling with which stones to get and their primary worry is buying something and not liking it, just buy Spyderco stones. If these stones don't give you great edges the stones aren't the problem. THEY WORK. The issue may be that someone needs a little practice, that's all.