I've been very pleased with it, and delighted that it is so easy to set up and use. Make sure you link it to you Google Calendar (or equivalent). It will automatically remove available appointments for the time that is blocked out in your calendar (plus any extra 'buffer' time you want, which can be specified in the advanced settings). Make sure you click on the link to View advanced booking type settings, as many of the settings you'll need to set it up nicely are there.