The ability of being able, at any time during day or night/weekends even from your mobile device is really great! I can't say anything bad about this software as it's very user friendly; all features are easy-to use but most important thing that i like in right inbox app - scheduling options (including recurrence).
So far everything works perfect without issues so no complaints here yet :) It has helped me organize my work much better than before when using Outlook + Gmail combination was not enought efficient way due problems mentioned above :D.