Great iOS interface!
I know this isn't advertised as an iOS interface, but it works really well as one. Of course you need the CCK (camera connection kit) to use this with an iPad. I am using it with my iPad mini to connect my guitar to Amplitube, and it works extremely well for that! Sounds great, and even gives me a line-out so I don't have to use the headphone jack on the ipad. Can't say that for the iRig-HD or Apogee-Jam. Also since it's USB, you can take a powered USB hub, and then connect this along with a USB mic, or a USB midi controller all at the same time into your iPad giving you a lot of options, versus both of the two other interfaces I mentioned use an OEM connector, so if you have those connected to your iPad you can't connect anything else at the same time.