I'll give credit where credit is due (from a couple of posts above) and say that Microsoft makes great keyboards and mice. They are absolutely among the best of their breed. Yes, it's a membrane keyboard but it'll still last forever. I've had more than one that I used so much that the plastic had worn away where I hit the space bar.
Err... I type fairly quickly but I don't type the way they teach in school. My hands hover over the home row but I use different fingers for different things. I hit the space bar with my right thumb and it's always in the same spot (or really close to it). I've had that spot wear down as much as a quarter inch.
On a good keyboard, and one that I've been using for a few minutes to adjust, I can hit 90 to 95 wpm with 100% accuracy. I can go faster but my accuracy drops quickly.
I am nowhere near a 'record typist'. Some dude got over 300 wpm not that long ago. It was mentioned in a news article I saw and it was quite impressive. He's just a kid, or was at the time. I can't imagine typing that fast. I'm comfortable with where I am right now. Plus, I can type while talking to someone about something else. I don't do that often as it is a bit rude - but so wasn't interrupting me while I was typing!