Sworkit was supposed to be an example of a complex app for ionic, not sure what else is out there. I've used that app and can say it seems pretty solid (no crashing, locking up my phone, etc.)

http://blog.ionic.io/built-with-ionic-sworkit/

I did a pet project using the vibration feature and it worked pretty well, but haven't tried on an iphone.

I can't speak for pushing the limits of the hardware though.