I used this last night, worked great for a small sushi order. I also tip in cash because it gets the drivers more money - I believe GH and DD give the driver the same either way (unless you tip big), so when you tip cash they make $9 and $6 respectively, plus your cash tip. Also, I like tipping based on the driver's performance. Last night I had an extremely rude driver who was upset about something, not sure what or why. I still tipped him but not the same as a driver with a more polished bedside manner. I delivered pizza to get me through college so I know all about using a professional attitude to get more money - it absolutely pays off, and customers remember the drivers and vice versa. This guy wouldn't speak to me and just held my food out the window by the knot in the bag, waiting for me to walk up and get it. When I thanked him for coming and gave him a cash tip, he put it in reverse and left... clearly mad about something. I once had an Uber Eats driver leave my food on the curb at the end of my driveway. Le sigh.