This WiFi speaker was exactly what I needed: I wanted to be able to listen to internet radio and all my PC music in other rooms, for example while cooking or doing the dishes, or relaxing on the sofa (or in the bath!). That's what this Mimi Qube does.
It's the size of a biggish apple, with the circumference about that of a normal mug. I've been carrying it around all over my flat: it's like carrying one of those small pillar candles. Very nice design and has this blue light on when working. It is easy to set up and operate.
The sound quality is quite good for its size, price, and use. I have used it in two and three rooms away from my PC and the sound quality is consistently excellent. The instructions say that there might be interference if you have metal walls or any metal in the walls. My walls have only brick and wood in them and the Qube works perfectly.
UPDATE January 2011: I'm still using my MiMi Qube, daily, with no problem at all after fourteen months.
UPDATE February 2012: Still using my Qube. I have since bought others as gifts, they make wonderful presents.
UPDATE January 2013: Yep, you got it: It's still doing brilliantly!