I miss BBM , it was great to have a dedicated app .
The second thing I miss with my BB is Profiles .I was nice to be able , in one click only , to turn on phone calls only .
I agree this imessenger is great but what it needs is a way to tell you it's been read even if the person on the other end hasn't activated there read button in general/settings. Sometimes you think have they read it and then they have. It should just be automatically set up.