But is it comfortable?

I saw a link to this on Jenny's site and I'm still not sure I can believe it. This "virtual keyboard" projects onto your desk and is able to tell what you're typing by the location of your fingers. They say it's compatible with the Treo600 but at $99.99 I need someone else to prove to me it works and your fingers won't get sore tapping on your desk before I shell out the bucks.