I have it on the Wii and can really say it is very addictive. Is it worth $10 on the iPad? Not sure, but I may have to get it to see.
From the reviews I've seen they all say that it's the definitive version. It just feels like it was made for touch.
Don't get it if you feel that $10 is too much for a well made game. Everyone is so use to $0.99 games that when anything comes out higher than that they say it's overpriced. I bought the game the day it came out and have never looked back and thought I paid too much for it. If you wait long enough I am sure it will go on sale at some point, but I rather just enjoy the game now and not have to wait.
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-gb) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5) Great game, especially on iPad. Worth $10.