Customizable look and feel
Poor list functionality, completed item view, sorting
I've tried this app many times, but really fail to see what people see in it. It fails my basic use cases of even a grocery list, where I need to complete an item, have it hidden, then uncomplete it when it's needed again, easily.
But then again, Todoist also fails this. Perhaps these are great for one-time use and throw away items. I use AnyList, and would otherwise use Paperless on iOS (or now Ikiru) before either of those.