I have been very happy with ScheduleOnce and the seamless integration with my Google Calendar. I have to manage many demos throughout the day and a constantly changing schedule.
ScheduleOnce helps me do all of this with ease. The interface is intuitive and, with just a couple of clicks, a client or prospect is able to lock in a couple of convenient times that work well for me. No extra work is necessary to sync up with Google after I confirm the date and time that works for both parties.
I highly recommend this app to anyone who is challenged to effectively manage schedules with clients and prospects throughout the day.