I prefer OS2008 since it is a step forward but the GUI is much slower and less polished compared to OS2007. For example, I have to wait 2-3 seconds for the "Device mode" menu to appear on the screen every time I try to lock it or switch off. Skype is much more stable with OS2008 than was in OS2007 (could never make calls over 10min). Web browser based on Mozilla renders more sites than Opera but it's a tiny bit slower.