OK, I tried out the new interface last night. Good News: The "All $20's" button works great. Fortunately, that's what I want most of the time, so my main need is satisfied. Bad News: The user interface on the "Custom Bill Mix" still sucks. It starts out assuming you want all $20's. If you want one $100 bill and the rest in $20's, you have to press "-" five times to get rid of five $20's and then you have to press "+" to add a $100. That's 6 total button presses for an action which should require only 1 button press. Getting two $100 bills requires 12 button presses when it should only take 2. Three $100 bills requires 18 button presses when it should only take 3. A smart interface would let you press "+" to add a $100 and then automatically remove five $20's for you (simple math!). In other words, you don't need "+" and "-" buttons for the user to select $20's. All you need is for the user to select "+" or "-" for the $100 bills and then automatically adjust the number of $20's to fulfill the balance (remember: the user already specified the total amount before they got to the Custom Bill Mix screen).
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Yes, the screen with two buttons for "Fewest Bills ($100x?)" and "Custom Mix" should have a third button for "All $20 Bills". Also, the Custom Mix screen should not start with zero bills selected and force the user to press "+" MANY times to match the total amount they entered on a previous menu. For example, if I had asked for $700, the Custom Mix screen makes me press "+" thirty-five times to get all $20 bills. On the slow touch-screen, that takes forever! Instead, the Custom Mix screen should begin with a quantity of $100 bills and $20 bill already entered which matches the total the user already entered. Then if they want to change the mix, they can simply press "+" or "-" to increase or decrease the number of $100 bills and the system will automatically adjust the number of $20 bills to keep the total the same.
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