Works just as well as the steam port of this game, and is just as much fun. For just $2.99 you can have hours of entertainment on the go.
Positives+: lots of content, fun gameplay, feeling of accomplishment whilst rising to the top of the food ranks, nice menus, lots of fun.
Negatives-: The touch screen controls are just a tad bit off and takes a little while to get used to and you need to have a good 10 minutes or so to sit down to play a whole game (but thats what the pause button is for).
Overall this is an amazing app and I definitely feel that I got more than my moneys worth. I am happy I bought this game and I feel you will too if you choose to do so.