U-22 : Great for iPad

I bought this interface to use it with my iPad and I find it is a perfect match. The best feature is that it can be powered by 2AA batteries. That way you don't need a powered USB hub to connect it to your iPad, just a CCK adapter. Even if you have a USB C iPad, this will not drain your iPad if you use it with batteries.

The features are basic, but just what I personally need. I like the fact that it has a stereo line input (which can not be used at the same time as the mic input).

The thing that I don't like that much are the knobs. They are almost flush with the interface which is great for portability, but they are pretty light to the touch - it's very easy to accidentally move them. I would also prefer 6.3mm jack for outputs instead of RCA, but it's possible they couldn't fit in this small device.

I never used it with a guitar so I can't comment on that, but the mic preamp sounds OK,. With a good mic the noise level is perfectly acceptable.