Ask HN: Tell me about your experience with productivity apps

There are tons of those apps: Any.do, Todoist, Microsoft todo (Wunderlist), Things, Omnifocus, etc. I want to do a small research on the use of those apps. I am thinking about three types of readers 1. The user: A person who actually use a productivity app * What app do you use? * What are the features you use a lot? * What are the most cumbersome features you wish they didn't exist? * Have you ever been in a situation when you are using an app and you say "I wish I could do that"? * Have you tried other apps before using the actual app? Why did you quit? * Are you using different apps to organize a workflow? Tell me about it. 2. The traumatized user: A person who once used an app (or several apps) and then decided to never use an app anymore. * What drove you to quit the app? * How do you manage your time without the app? 3. The person who never used an app: * Why you didn't consider the option? * Do you have some particular fear/need (privacy, accessibility)? Feel free to talk about anything that I didn't ask above. I want to listen to you.