I reviewed this lot last year and not much has changed - they still take the title of a never been performed musical from the audience and perform it. Some of the harmonies are a bit dodgy but it just adds to the comic effect, as the plots twist and turn but they never forget the plot and this is some of the slickest impro you'll see.
Basically, read last years review. They're still great. I would write more but I'm not feeling well. Sorry.