BBM has been available in the App Store for less than 24 hours, and it's already the #2 most popular app in the U.S.'s Free category in Apple's App Store. Granted, if BBM is able to stay at or near the top for a little while it will be really impressive, but based on how many people were saying BBM wouldn't even take off upon launch, being #2 is pretty great.
No word yet from BlackBerry on exactly how many people have downloaded BBM for iPhone and Android, but we do expect those numbers to come out eventually. So far, the roll for BBM has been pretty smooth. There haven't been many issues reported to us, or that we've seen out there. I'm guessing the waiting list method is preventing clutter from happening, so props to BlackBerry for going with this route.