the t.mix MicroMix 1 USB

I use it for a vocal effects chain because I needed a really compact mixer with an RCA output.
If you're doing small gigs with a mic and one isntrument, this unit is awesome. You don't really need more than the basic 2-band eq for small clubs with minimal p.a., and can pass your whole setup through a looper with this unit. Panning is something you don't regularly see on a mixer this small so that's a neat extra as well.
The sound quality is perfectly fine, clear without any audible noise in live settings.

The 2 biggest pros:
-It's ridiculously compact for the features. Make sure to have proper padding around the unit so nothing breaks, the knobs are mostly plastic. But on the other hand, it fits in anything really.
-USB power supply- no "oops where did I put the adapter". Use whatever cable and power source you want, just watch out for the A and V specs, but it shouldn't be a problem with most adapters.

Can't really go wrong buying this unit- I'd recommend it for most studios and small venues as a cheap emergancy backup unit or an insert/adapter unit for certain signal chains as well, it barely takes up any space and costs next to nothing.

A solid 5/5 in it's price range.