Installed on iPod Touch 2g with a minor issue to report. After the update was all done, I disconnected the Touch, went into Music.... only to find nothing. I thought, okay, I need to re-sync the playlists I guess. So I plugged it back in, it synced back and I saw in the usage bar that my audio was still on the Touch. I disconnected again, went into Music, and no go. Nada, Zip.
So I figured, shoot, I need to restore. Plugged it back in a 3rd time, but I noticed syncing was taking slightly longer this time around. I disconnected it, went into music, and I saw "Rebuilding Library" or something similar. Voilà, music was back!
So far I can't really tell if it's any faster or slower. Sometimes it feels slightly faster, sometimes slower, depends what I do. So all is good I guess