Great addition to my iPad and iPhone,
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This review is from: FOCUSRITE ITRACK SOLO Audio interfaces iPhone - iPad Interfaces (Electronics)
This has really increased the functionality of my iOS devices, as it effectively turns them into portable recording studios. It works with AmpKit, an amazing app that simulates guitar and bass amps, and Garage Band for iPad. I'm sure it will work with other apps too, but I haven't tested it. You can also link AmpKit and Garage Band (for recording) with another app called Audiobus, thus achieving the portable recording studio I was referring too.
So, in summary, this works with iPad, iPhone and PC (tested). It can be used with electro acoustic, electric and bass guitars (tested) and you can connect an xlr (including phantom powered) microphone to it. The only draw back is that it doesn't have a stereo input for recording keyboards, but you can buy those separately for the iPad!
One thing you should take note of is that this device does need to be powered by the supplied usb cable (either via a computer or a usb plug adaptor). Interestingly, when you connect the powered device to your iOS device, it doesn't charge them, which I found disappointing, but a small issue really, as battery drain isn't excessive.
All in all; a wonderful product that I'm really pleased with. But charging capability would be a welcome improvement!