Also, it handles time ranges, subject, verb, multiple time selections, and timezones of the person you're scheduling with. I've been using it for a long time already and it's pretty good at handling crazy stuff like:

"Meet with sam@gmail.com and jim@gmail.com next wednesday from 3pm to 9pm or first thursday of next month from 4pm to 8pm"

This creates an event that allows sam & jim to choose between these 2 dates. If presdo had an api to extract this information, I'd be on board!