Should I get a Blackberry? Pros and cons?

My contract with AT&T ends in December, but I'm thinking of ending it early. I'm switching carriers, and I was thinking of buying a Blackberry. Is it worth it? If it is, which carrier should I get it with? My friend has a Blackbberry Curve 8390 or 8330, I can't remember which one.

HELP!
 
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