It works really well; just plug it into a standard GU10 socket, switch it on, and play! See the pictures for an attractive purple colour, and a picture of the remote.
The remote control allows you to switch it on and off, dim it, and select from 16 different colours. You can also have it flashing, switching between colours, fading in/out, etc.
I got it in the 2013 LITB super sale. Overall, $8, plus a small shipping fee ($2.90, including insurance), was very good value.