I'll use it...
Like iMessage but compatible between all devices.
... which have installed the BBM app and set it up ... Which is the same reason other third-party multi-OS chat clients have thrived but only within the confines of a rather small niche.
I know people that still have Blackberrys so being able to BBM them will be cool.
Sigh. I suppose there's that. I always got by with just SMS to them though. Isn't there a WhatsApp implementation for BB10?
So many haters... now I really don't need to pay for texts. I am aware WhatsApp exists but so few people use it. At least BBM is something a lot of people know about.
Outside of Blackberry diehards, BBM is completely unknown. If they go on marketing with the full name (ie, emphasize
Blackberry/ Messenger) then they run into the wall of folks with
horrible impressions of Blackberry products due to their repeated high-quality-marketing / low-quality-delivery consumer pushes. So, I don't think it really has an advantage to speak of over WhatsApp etc.
And, IMHO, the texts thing really chapped me a few years ago. But now my phone plan has unlimited texts, so I really don't care. SMS is far from perfect (hence the "simple" part of the name), but it gets the job done. I definitely prefer an integrated solution like iMessage (on iOS), or even BBM on Blackberry, over SMS or a third-party app. The thing is: except for a rapidly-disappearing core of BB hardware diehards, BBM is a third-party app, not an integrated solution.