For a whole 19 tracks (18 if you discount the weird "smash-up" thing), it's a great value and definitely worth adding to your collection if you like Katy Perry's music.

and it was the album's 5th chart topper thus tying Michael Jackson's Bad album for most chart toppers, but another single was released and failed to top the chart (to break the record) but peaked at #3 as it was The One That Got Away (no big pun intended)