Not very useful if it doesn't manage to scrobble tracks listened to on an iPod (which the old iScrobbler manages to do). If they fix this, I may consider buying it....otherwise it's no more useful than using the old iScrobbler plugin and QuickTunes together (which combined, still use up less memory and cpu power).
Other than this, it IS the prettiest iTunes controller out there.
If they allow synced iPod tracks to be scrobbled, it would be perfect.