Just chiming in to say that I'm yet again finding myself incredibly impressed with my WASD keyboard. November is National Novel Writing Month (NaNoWriMo), and the challenge is to write a 50,000 word novel, or 50,000 words of a novel, in the month of November. A mechanical keyboard is proving to be absolutely brilliant for sitting down at the computer and typing for hours. I love it. My speed has improved, I think my accuracy has improved, and I feel better with my writing in general. If you're on the edge of deciding to get a keyboard, I'd highly recommend it.
I love the 'click' sound. It reminds me of a typewriter.
Btw, do you use any wristpad? I find it a bit hard to use a keyboard without one.