it's terrible! Well put together etc. but it's built around XP so the changes are mainly cosmetic, it uses about 20% more CPU time than XP and offers very few advantages which are just niceties like the per program volume control etc. it's a good feature, just not worth 20% more of my cpu time. Oh, and it cloggs up your RAM, haven't checked the GPU though as I decided that I'd done enough tests to get rid of it without doing more tests.
To sum up, nice to have a play with, terrible as your only OS. Dual boot may not be a bad idea though...