I used octo for four years in my day job at an HR software firm - it worked well enough but not always intuitive to use as we all had different jobs there! My most recent employer only uses google calendar so was looking into alternatives when they asked me how else their staff could schedule/manage meetings outside of our internal system (which is terrible!).
We were able solve this problem by using one app called 'octosched' which allows you sync between multiple apps like gcalendar or outlook etc without having 2 separate clients installed side-by-side!! I like how easy it is to use for both my clients as well myself! It's very user friendly which makes scheduling easier than ever before!! The only thing about this app i dislike would be maybe adding more features in order to make using all of its functions even better? Nothing really at first glance but there are ways around everything if you know what they're doing :) Great product overall. Easy way to schedule appointments online without having an office manager or assistant do so every day!