I love Peggle as well as Peggle Nights. Even after you beat the game, theres still many more challenges to work on.
However, with the recent update, the game has been adjusted to fit the longer iPhone screen. Its great that theyre trying to improve on how the game looks, but rather than the black lines you would have previously, its red bars that are part of the in-game console. I find them to be really hard on the eyes, and I would much prefer to have the black lines/frame back. Just too much red.
Other than that, the game, as well as the Peggle Nights pack are well worth the money.
Beccacoles about Peggle Classic, v1.7.1