The blackberry market is dwindling. Unless you have been a blackberry fan in the past, their current lineup won't offer you a better experience than your current iPhone/android device.
Their enterprise customers are keeping the company afloat, IMO. More so on the software/support side than hardware. Also users that are interested in secure communications via bbm internationally will be hesistant to give up that feature. Of course you can get the bbm app for iOS/android devices now. I feel this was a desperate effort to not lose the BBM brand to a market that is now offering cross platform alternatives.
Currently I'm using a Q10. My favorite RIM device to date is still 8800 World Edition. The phone was a tank and ranged usually about 3-4 days on a single (full) charge.
I use a blackberry for the keyboard, the battery life and again, the keyboard.