After reviewing many products I had no hesitation in buying ABPro as other developers had all seemed to fumble the ball in making a product for bookings by time.
This Booking system is so well thought out, and being structured on timeslots per resource (which can be a person, facility, service etc.) extensible for so many uses, unlike other systems limited to hotel bookings etc.
As other people have said, I have found that Rob replies swiftly and courteously to questions, and continued intelligent development seems assured.