I know most of you have already read reviews of Knothole Island or purchased it yourself and come to your own conclusions. I just finished the Knothole Island quest last night and I feel the need to make a post about it.
Overall impression: Good, but definitely NOT worth $10. I would recommend it at $5.
As with the rest of the game, Knothole Island offers really great, colorful graphics and a pretty interesting storyline. It also gives you some cool new items and a special shrine that most of you have already read about. If you haven't yet and want to: .
The main quest itself, which unlocks "The Meteorologist" achievement, is good fun but that's pretty much what you're paying the $10 for....