Correct me if I'm wrong but I think what makes BBM so "amazing" to BBM users is the fact that you have a BBM pin (you can add any international contacts without having to look up dialing codes which are so hard to get correct)
Secondly BBM allows much bigger groups than what's app, BBM allows either 50 or unlimited number of people per group, what's app I think has a limit of 10 if I'm not mistaken.
It also has video calling and is free, what's app is about a dollar a year.
...then they mention security...is anyone crazy enough to forward very confidential banking details through a phone ?...I know I do internet banking on my phone but that is through the banks official website and I cant send an SMS or BBM message to make a transfer.
People go on about security like they are top secret agents...yes, when you say halo and make meetings/conventions with friends you need top notch security as no one must know that you are talking about shopping, food, clothes, Justin Bieber, what you did today etc...no hacker cares.
Though I will admit that what's app can do with many more features such as VoIP on video phone calls but I just use it to talk to my family...I dont need anything fancy.