The concept is good for those that have a regular schedule (I don't), although one would need to schedule in daily activities like showers, lunch, and all the other stuff for it to be close to precise when finding time for tasks.
I love the graphics of the app, but I find it's not yet usable (getting there). I need to be able to see monthview upon opening the app, and also be able to double tap a day and see a smartview list of events and tasks for just that day.
Creating events in my circumstances is also cumbersome if I don't know the exact date. Smartview sometimes requires a lot of scrolling and sometimes a bit of math to find the date I need to create an appointment for (the third Friday of next month is what date?). Monthview quick add has limited options (duration of an event can only be 30 minutes, 1 hour, 2 hours, or three hours), and there's no way to duplicate or copy and paste an event in monthview.
I do most of my planning and creating appointments via monthview, and I have a lot of irregular recurring events with time durations of 45 minutes and 90 minutes.
Going back and forth between monthview and smartview to do what I need takes too much time.
I imagine SmartTime will eventually become a very usable app, and I check on the updates via AppSniper to see if it an update meets my needs.
I will definitely say I like the graphics a whole lot better than a couple other apps I have tried.