Please, don't listen to the reviewer below who says the production is disgusting. He must be a person scared of everything original or slightly different, please don't listen to him.
First, the cast. No need to say anything save that it's great, spearheaded by Bryn Terfel and Barbara Frittoli. Second, the music, just incredible, with the RPO conducted by Bernard Haitink, just amazing! Now, the sets: This part may be the most controversial, if anything just because of it being original (and very clever, I'd say). The sets are very colorful and cartoonlike, which only adds to the comic feeling of this greatest of comic operas. David McVicar is I think, the greatest set designer of our time.
Trust me, you can't go wrong with this one.