Good simple typing tutor, a little costly

Pros:
- Good simple, intuitive interface — fast & easy to use
- Unlimited lessons (they’re auto-generated)

Cons:
- Reporting of speed over time works oddly (e.g. if I’ve done 30 lessons, it’ll show me my speed on the 1st 18, then skip 19-29 and show me #30)
- A little expensive for what you get

natustx about Type Fu