Does anyone have Playlink (Hidden Agenda, Knowledge is Power, That's you, Singstar) impressions?

I bought Hidden Agenda and Knowledge is Power. I also picked up That's you for free. I am trying them all for the first time this weekend at a Halloween party and am curious how they are? There aren't many reviews out yet. I have seen a few impressions of Hidden Agenda on here, but more would be appreciated. Has anyone tried Knowledge is power? If so, how is it?