Onyx Producer 2x2 : Great value with a few shortcomings

Pros:

+ Good feature-wise for the price

+ Sturdy case without any wobble in the knobs

+ USB Class-compliant

+ Small footprint, useful for a cramped workspace

+ An actually useful manual (the one available on Mackie's homepage that is, not the quickstart in the box).

Cons

- Gain knobs have non-linear behavior, which means up to 80-90% of the of the knob can be just silence and all of the usable range adjustment is compressed into the last few degrees of turning if you have a low sensitivity mic.

- Phantom power and line/instrument buttons don't remain in their "pressed" state between USB disconnects, which is a minor annoyance e.g. if you frequently connect/disconnect a laptop to an otherwise fixed setup.