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I like this product because it's quiet, does audio, MIDI and charging all in one. I put a 30 pin to Lightning adapter to use it with my iPad Mini. Works great with GarageBand, Loopy, etc.
Using the iPad in the studio without this device usually turns into a mess with flimsy 3.5 mm connector, iRig and a dangling USB to midi adaptor. This docking station does it better: slide your iPad into the docking station and it becomes one device with 1.4 inch jacks, microphone jacks, midi, USB, charger ...
iPad Air doesn't work without (expensive) apple convertercable. Do not think a cheap ebay version will work: it won't. Further more; non generic power supply. I've warned you, stay away from this.