I run my own marketing company and have used BookingBug for 2 years now. I had to persuade my team that it was the way forward and it has proven to be the single factor that has had the greatest impact.
I am about to start using it with another business. BookingBug needed no selling. The new client just asked me to do the same as the success of the other business is high profile. Nothing else in InternetLand touches it!