I got it, and in hindsight I probably wouldn't get it again. You get Bluetooth Audio streaming without it. The ONLY benefit to BMW Apps that I can see at the moment is that controlling Pandora from a car that DOESN'T have it is apparently finicky (THE TECH mentioned that to me once in a separate thread), whereas it's solid with BMW Apps. But as it turns out, I don't use Pandora much in my car. Actually it turns out I hardly use the stereo at all given the symphony available under the hood.
Bottom line: If all that's missing from the car you're looking at is BMW Apps, buy it and don't look back!