Yes, I like the auto tipping, Having to scramble to have the cash ready or preparing it before hand is just one more bother I can do without.
I usually tip an extra buck at the bar on single drinks. The 15% they add just isn't enough. Are they really getting that 15%? I heard in Mexico that when it says gratuities are included, the people are not getting anything at all. That's why I tipped at the all-inclusive resort I was at and I got first rate service once the staff figured it out. I never waiting in line for anything. They would serve me at the back of the line at the bar and come directly and seat me at restaurants in the hotel. I just tipped them the normal amount I would here in the states. They're are not any less valuable than people here is the way I see it. I am a guest in their country.