Party nice song, but no French song in the playlist, and pasmal parts grated ... (in English ca somewhat complicates the trick). But hey, there is the possibility to download content, has a rate of 120 title.
Party Dance disappointing, no preview not, you have to be synchronized, so not obvious when one does not know the choreography before.
In short, interesting for singing, it's still Singstar, but not n Dance brings the little extra hope.