1) My iPhone and desktop versions of To Do are not syncing, even though I used the same email address on both.
2) Sorting works differently and missing functionality. My new entries should go to the top, which I can do by using sort. But I used to be able to move them around after that sort. So the sort should be a one time thing, when you select it, not force you to keep things in the same order.
I haven't even asked my wife to upgrade yet and try sharing our grocery list. Maybe I will just stick with Wunderlist.