I get my Crackberry 8800 tomorrow, replacing the POS LG 535 I've been using for years. This will be my first data device... I'm pretty handy with gadgets but I'm expecting a steep learning curve. Can't wait to try it out, even though it will probably ruin my life.
If you've used a Palm or WM4 or 5, then things will be a little different coming to the BB (mainly the menu system, I would say). But it doesn't take long getting used to it, and since you'll have a hard time putting it down, you'll get used to it pretty quickly