While great in theory the execution can be painful. If you have these in your restaurant then at least have two. People have enough trouble retrieving sporks and straws and now you present them with thousands of flavor combinations?
Think about what flavor you want beforehand. There is nothing more frustrating that watching someone hunt and peck for Orange Flavored Sunkist when it’s not even a Coke product. Have an additional dispenser for just ice and water, this will speed up the queue and reduce the glacier of ice that has formed because of trigger happy customers. I would also be nice if these machines could detect the type of drinking vessel so that you don’t cascade the soda over the cup onto your hand. Or maybe just have one size for this machine and tune it for proper filling.