I like my sharpmaker a lot! If I were you, I'd DEFINITELY get one.
I don't mean to brag, but I have been known for a LONG time (way longer than the Sharpmaker has been out) for putting a very sharp edge on knives. Seriously, I've had both friends and family swear that I could put an edge on a brick! All it took was a LOT of practice.
If you don't know how, my advise would be to definitely learn to sharpen freehand before you learn any sharpening system. You should learn what it takes to make a knife sharp. It's not rocket science, but it can be sort of difficult on some knives. Just get some benchstones and some el cheapo knives from the flea market. Dull the knives and try to get them sharp using the benchstones. (the most important things are even pressure and holding a consistent angle) Once you know what it takes to bring an edge back from the dead, you will be ready to learn to use a sharpening system.
Could you go from not knowing jack about sharpening to using a set angle system to sharpen your knives? Yep. But there are cases where the sharpmaker (or whatever other system you choose) won't work. You need to learn freehand sharpening to correct the situations like that. An example would be if you blunt the tip of your knife really bad - will the sharpmaker fix that? No. It will probably make it worse. You need to know almost instinctively how to change your freehand sharpening angle to make the edge meet with a new sharp tip. I don't know anything that will teach you techniques like that other than lots of quality time with a benchstone.
Anyway, if you already know how to sharpen freehand get the sharpmaker! If you don't, I think you really should get a few benchstones in different grits to learn the basics on, AND a sharpmaker.