As I promised Pepedog in the thread that is now locked, I am here coming back with my experiences of the XBMC performance on Utilite.
I am using the git version of XBMC, standard Arch linux utilite kernel, and the libraries. I am very happy with the performance. HDMI-CEC works, picture and sound is good, at least for my standards. Feeling the top of the Utilite while playing a movie it does not feel extremely hot.
There are however a couple of issues:
1. XBMC sometimes crashes when starting a movie. This does not happen very often, but sometimes. It does not seem to be due to the movie since it may very well work fine after reboot.
2. If XBMC crashes and simply restarted, HDMI-CEC will not work. Needs full reboot for that.
3. HDMI-CEC only works for root user due to file permissions.