I'm giving it a try right now for you. They look very good, extremely readable. Not my favorite choice of font, but you're doing this for you, not me.
The dictionary lookup doesn't work. Also, quite a few words are split into two - that is, when I move the cursor around, the Kindle thinks it's two words. "circulation" on the first page of Chapter 1 is an example.
Those may or may not bother you.
So, I have to ask, why are you going for pdfs over mobi?