I just purchased one as a birthday gift to my self about 2 months ago. Trust me, it will be soooo worth it, especially if you know folks who also have it. Several of my Sorors (including my chapter Basileus) have it. You will have a tmail email account which will allow you to send emails instead of wasting your phone minutes.
Sidekick II features:
Privacy Lock
Downloadables
AOL instant messenger
Yahoo instant messenger
Email
Phone (of course, lol)
Phone voice mail and text messaging
Address Book
Web Browser/Internet
Camera
Calendar
To Do Task List
Notes
Games (downloadables)
Threaded Mode