Its definitely worth 10 bucks.
One of the best and truest to the roots adventures when you liked the Sierra Adventures like Kings Quest VIII. Some Puzzles are a bit out of the world but you are definitely in for a treat. Its definitely my favorite adventure by FAR of the recent years. Actually I was thinking about creating an OT when it came out here, but it wasnt out in America yet and I wanted to wait. Well seems I missed that point.
The game is great, has some unbelievably charming characters, smart puzzles (that get hard later on) and a very memorable ending.
The Whispered World is a great, one of the best and definitely the most underrated of the recent adventure games. Highly recommended. The voice of Sadwick is annoying though.