If you have an old Thinkpad, I'd highly advise you purchase more than one of these skins.  I'm still able to surpass 60 words/minute easily with the skin over my old T510.  For an "A" in my Personal Typing Class you had to achieve 60 words/minute on a mechanical Royal 440 with blank keys.  I know for many, that's not very fast but those of us who can still type are spoiled today compared to what was available before an IBM Selectric was invented.