Fails at its most basic function: to make orders or cancel orders. It crashed on me multiple times when shopping. And when I tried to place an order, it crashed again. So I went to check my order history to ensure it didn't go thru. Order history was blank. So I placed order again. Only to eventually find the original order did go through, silently, so I got charged double. The engineers have utterly failed to deliver the most basic of functions: trust that the buttons I press work.