Being still some what new to sharpening (around 8 months, or less than 50 hours under my belt at the time of this post) was told technique is where it's at....or at least plays a major role in free hand sharpening.
I only own 2 stones, one synthetic one natural, both made in china, both combined cost less than 10% USD. But with these two stones I can put a hair whittling edge on a knife.
But yeah....do try to avoid MIC stuff, the synthetic one has lots of impurities in it, often at times when I'm half way through would hear a loud clack, and the edge is dented from hitting an impurity and have to start over. The natural one doesn't respond very well to PM steels, and makes a screeching sound like scratching black board some times.