The performance seemed lacking, but more importantly, while watching the demo the concept of an "activity" confused me -- I assume its similar to the notion of an app, but it was hard to tell as the "activity" was represented as a desktop -- overall fairly confusing.

It doesnt look ready for prime time but its exciting to see the FOSS community working on it; who knows, in a few years it might be able to garner the same eminence as xbmc has in the htpc space.