I dislike the sorting options in the MIssions app, and wish it gave me more flexibility.
But the BIG problem is the SEARCH function. On my android device, let's say I'm doing Cat Food.. The way they list items, they don't put the brand first, so sorting a-z doesn't work. I figured, OH! I can search for "Purina" and get all the Purina stuff done, since it's all together on this shelf! But, something is wrong with the app, and the search input bar. Go to Search, place finger on the search line, and begin typing, but the cursor only takes "P". So I re-click the line, and it only takes "u". One letter at a time. r i n a. Painfully slow. I find that the microphone will let me enter a whole word on the line! Yay!.. BUT if I want to do a new search, I cannot easily erase the previous search term. ARRRGH. I sent in a "bug" report to the app tech support, but NO REPLY. I will soldier on, but it makes this a lot harder.