Just installed it on Kubuntu 9.04 a few days ago. It was really nice! It added a couple widgets to my desktop, though. I easily removed them, but it was nice to see they have them available.
I won't be able to test it more in-depth for a few days, though - my dad is doing some painting/remodeling of my room and my brother's room. Luckily we have a family laptop stationed in our living room, from which I am typing this.
Anyways, it's good to see KDE getting better and better.