It worked flawlessly on the iPad 4, but it a complete disaster on the iPad Air. Bias won't work at all. Others like AUFX: Space/Dub work about 50% of the time. I've uninstalled and reinstalled the apps and even restored the iPad to factory settings, but nothing helps. All software including iOS are updated to the latest versions. This doesn't seem to be a problem in GarageBand or Auria. The apps work fine with Cubasis through AudioBus. Also, there is a bug with freezing MIDI tracks that are using IAA. They are sometimes (usually) horribly out of tune after freezing. It always happens with Magellan, but I've had it happen at times with SampleTank and others it will work just fine. That issue occurs on every device I've tried it on (iPad 4 as well as Air). I've had it occur with mix downs as well.