I don't know about you, but I like technology that makes my life easier or more organized. There are many applications out there that have a ton of features and can track every area of your life. While this is all well and good, many times with the increased power comes an increased learning curve and intricate UI (user interface).
Not so with Wunderlist. This application is a straight forward to-do list. It doesn't pretend to be an all encompassing task manager. Others have discussed its minimal, easily navigable interface, so I will not repeat those findings here. I will mention that the power of this app is that is will sync on any computer and iPhone/iTouch with a simple account and password.
I have been using Wunderlist for about a month now and have found it to be helpful for organizing all the things I need to do. I like that I am not distracted by the interface or by trying to figure out how to add a task. All is done simply. I like that I can create separate lists for different projects, this helps me to keep my thoughts and planning organized. I have been able to keep separate lists for home, work and individual projects. All of these are synced to all the machines I use so that whenever I might have a thought about what I need to do I can add it to the appropriate list and it will be available no matter where I am.
I would disagree with some that find switching between lists annoying or distracting. I have found the fly out to be a quick and easy way to navigate between my separate lists. This also negates the need to create an entry in my "inbox" (I renamed mine to something more useful for me) and move it later. I can navigate to the appropriate list and add the entry there.
I have been happy with Wunderlist because it offers a clean, easy to use interface, syncs across all my machines and does not add distraction to what I need - a to do list. If this is what you are looking for, I highly recommend it. You have nothing to lose as Wunderlist is free.