It's easy to use, but the Powerdiary booking calendar as used in the place where I see clients allows double booking which sometimes causes considerable dramas. We all book independently for 4 consulting rooms so we have to be really careful to check 'all diaries' as the system doesn't alert us to overlaps. The office folk have tried to find a solution with your folk but without success. Also, when I signed up personally, I asked for one calendar and two appeared, so I supposed it was a bonus. I actually didn't notice (not great with admin) that I was being charged for two booking calendars for a long time. Ouch. I see the options still state one or three (or more). I am now paying for only one as my husband went into the system and rectified it. I took that as a lesson in my own poor office processes. I'm not sure what happened there but that was pretty upsetting, as I didn't sign up for two calendars . But I am still using Powerdiary for now. I may swap to Healthkit at some point.