For context, Sorted is one of the more prominent productivity apps in the Apple ecosystem. They also have what appears to be a pretty nice privacy policy, which would be my concern for these apps that want integration with your calendar information.
Apart from the nice privacy policy, Sorted is really great for people like myself who tend to overfill their todo lists, and subsequently feel bad at the end of the day when they don't manage to complete everything.
Sorted pushes me to assign time estimates to the task, which helps me to keep my todo-list for the day more realistic and manageable. I like it more than managing my todos in the calendar, as for example the Make Time people would probably like me to.