my bro has one, and he works at Research in Motion (the company that makes them). He got it for free when he started there, and they're pretty cool, if you do a lot of business its priceless
blackberry is more serious then the hiptop. That shit is like straight buissness man, I really can't see talking on it either, alot bigger then the sidekick.. but since you don't have many other options I would look into it.
u know the blackberry is also known as the crackberry because of its addictiveness. i have the option to use one for work but choose not to simply because it means clients can track me down alot easier which is not always good. i have played around with them. 1stly they are as ugly as sin 2nd they are cheaply made- it has an incredibly plasticy feel to it. what it comes down to is simply would it be socailly acceptable for you to use a sidekick. the blackberry gives of a more professional look but the sidekick looks and feels alot better. i don't know about the software- which is better etc. hope that helps
The one my bro has is pretty cheap looking, but in a few months they'll give him a better one which has colour and all that jazz. They have some pretty nice ones, i'd take the higher end blackberries over a sidekick anyday