You're a little ahead of me, but I'm on the bandwagon as well!
I got a 4th gen 64G ipad for my 50th birthday. I don't have an iphone, tho, actually my phone's not even "smart" - so I just started into the world of istuff. I've been looking at getting that iRig MIDI like you have in the pic, but yes, I would also need a lightening to 30pin adapter for it, which makes it much more expensive.
I've thought about using it to control my patch changes on my keyboards for live play.