[ThereThatGuy]

This is for the Android version, I can't speak about the iPhone version.

My buddy has the app, It's a good little tool. It can detect the BMW specific codes when apps like torque can't.

I used it to code some features on my car, Roll up windows with lock button, Change blinker speed and blinks. That's about it.

As for if its worth it, That's all up to you. If you are planing on using it all the time or on multiple cars I would recommend it so you don't need to haul your laptop around all the time.
But if it's just like a ehh I'll use it every once in a while just to do a checkup then I'd hold off and just use your laptop.
But it's all bout convenience, If that's worth the $50 then go for it by all means.

Also on a side note, The developer is always pushing out updates around every week or so. Support it also good from what I hear.