The RIM Blackberry 6750 is a very nice device.  The reliability and productivity of the entire suite of RIM Blackberry devices is unmatched.  If you want email on the go, RIM Blackberries are by far the best game in town.

 

That said, there are many new blackberry models that offer better value than the 6750.  First, I'd recommend going with a color display like on the 7750.  The 6750 features a black and white screen.  Second, the processor on the newer devices like the 7250 are noticeably faster.  Third and lastly, the screen resolution of the newer devices liek the 7250 are much improved. 

 

In summary, this device is great if you a cheap way to test the blackberry world.  If you're planning to be a blackberry user for a while, spend the extra money on a 7250 or one of the new models that will inevitably replace the 7250.