I got one and was very excited to use it at work, but ended up never doing so. I didn't use it often enough to justify it taking up so much real estate in my pocket!
If I needed to look something up, I simply looked it up on the internet on one of the computers. Or *gasp* in a book
Overall I liked it. It's a Palm Tungsten I think. Maybe you can get one cheap on Ebay or something.