I have tried LOTS of other grocery/shopping list apps and AnyList is hands-down the best. It has tons of intelligent features and yet still has a nice, clean interface. AnyList is especially amazing when sharing lists with your spouse... Just add items to a list and they sync to your spouses AnyList app on their iDevice. It makes shopping so much easier to manage and complete.
And support from these folks has been great. The few times Ive emailed in with a questions Ive received prompt, friendly answers.
Beil about AnyList: Grocery Shopping List, v5.1