I just installed UKMP and Kaku yesterday - and while the UKMP GUI is very nice - it doesnt bring in Album art for unknown albums (non-english) that I have. Kagu on theother had did it much better . Also the user interface of Kagu is better I feel. Ultimately I am sticking with Kagu for my music player needs. The kinetic scrolling is really nice.

I particular (about Kagu) I like that there is an exit button to exit straight out of the app - I canb control volumen from within Kagu itself, nice colours-sotthing on the eyes, inertial scrolling is good and some nice settings to choose from. Overall a nice user interface.

The built in app is simple and is also good - in the functional sence.