Great iPad companion
The iRig Keys is a very useful tool for musicians on the go. Works great with Garage Band and other apps. The size is ideal for traveling and it is very nice to have pitch and modulation wheels.
It is very light but the construction is not very sturdy. The keys feel weird, not because of the size but because they are poorly built. I guess they should be improved in future models. (The old Hohner melodicas have much better keys and are about the same size)
Anyway, it is a very good investment for a musician who owns an iPad or iPhone.