Your software adds items to the cart BEFORE you click "add to cart". I have mistakenly ordered an extra pizza twice. Also there is no confirmation screen that shows the order in full before you commit to "place order." If there was such a screen I would have noticed the high total just before finalizing the order and gone back and corrected it. Also, just the fact that there's no grand total amount shown to you after you've added a tip is pretty annoying. I realized recently there is essentially a hidden fee charged by the restaurant that is not revealed to you at any point as a line item in the process of ordering. That leaves a bad taste in my mouth.