SO GOOD. The experience depends somewhat on the people that you do the tour with... but I think you can assume that most people who are trying to get day-drunk are at least a little bit entertaining. The tour and the bike were more exciting that I had expected, and the bars that we visited were great. Best part of the whole thing, though, was our tour guide, who was kind enough to give us a ride back to our hotel afterward so that we wouldn't have to call an uber.
The only issue that I had with the whole experience was that I had originally booked a 7pm tour--and got a confirmation email for it!!!--and had decided to call the tour group the morning of, just in case. We were very fortunate to have done so because Viator had somehow messed up??? and sent the tour group a confirmation for 4:30pm instead of 7pm, so the tour group were able to get back to us just in time for us to cancel our other afternoon/evening plans in order to accommodate the last minute time change. Make sure to confirm your time slot directly with the tour group!!