I have to say most of those songs don't fill me with glee -- I mean, My Perogative is possibly the only one I'd bother downloading from that ep, and that's only because I really like the song. Otherwise, most of the performances didn't seem much better/different than the originals.

Having said that, "At the Ballet" is my favourite song from A Chorus Line and always makes me tear up when I see the show, so I'm ridiculously pleased that Rachel, Santana and Kurt do a version of it. (And I'm making a mental note to download that as soon as I get home.)