Well, since I just came from my original Storm 1 in August, I will give you my opinion. I had the storm for a year and a half. The only way I kept it that long was that I was always upgrading to the latest hybrid os's on crackberry. I squeezed all I could out of it. I was never much of a bbm user. Some bb users say they miss bbm, but gtalk is good. I usually just text.
D2 is superior to bb in most ways. I dont use enterprise email, but I have read that android is both adequate and not. YMMV.
I got the D2 when my storm crapped out because there were no Dx's or Dinc's in stock. I figured I would swap for one of those within the 30 days. Last sunday, I went to my local vzw store to try out all the phones again before my 30 are up. I tried out all the android phones, storm 2 and bold. I never thought I would, but trying out the all screen phones, I really missed the D2 keyboard. The best thing about it is freeing up all that screen when you pull out the keyboard. The precision is good and everything is predictable. Kinda like a bb keyboard, just different? When I tried out the storm 2 and bold, I knew I would never go back to bb. It was familiar and..... blah. I am so very happy with android vs bb.
I left the store with my D2 and was very happy to do so. I like the other droid phones, but the D2 is Ausome! I am very happy with it.