I had a horrible experience! I asked for a Coke Zero, they brought me a "on tap" one, ok, not a big…read moredeal, they said I should have asked for canned (I think the waiter should have told me there was a choice...) but, again, no problem at all.
The problem is that I asked twice if he was sure it was a zero one (I'm diabetic) the waiter said, twice, 100% sure, my blood sugar after the drink got almost to 300 (I didn't have anything else than the coke)!
Maybe it's just an accident, but for me, and in my opinion, very bad, so I won't go back there again, nor tell anyone to go!
For me (having a special device), it's been just a bad evening, but I don't think this is the way to manage a business, and how to deal with customers!