Marking complete by mistake
 

It is too easy to mark an item complete by mistake. Sometimes I'm trying to scroll through a list of items and I accidently hit a checkbox. In the old UI, it would stay in the list and I could just hit the checkbox again to bring it back. Now as soon as you check it off, the item disappears! This is not good, can you restore the old behavior?

You could turn on Undo support, then shake your phone to undo the completion.

That worked well. Why is undo marked as an experimental feature?

Yup, I'm definitely with you on this one. It's all very well enabling 'undo' support but, particularly if you're out and about and using your iPhone with one hand, its very likely that you wont notice that an item/action has disappeared!

I've certainly arrived back home minus a shopping item or two because of this. I really feel this new behaviour should be optional and/or a 'cleanup' button provided as in the desktop version.