I am a user of Mac OS, Windows, Android and ios systems for work and personal use and I like that Wunderlist is availible for all the systems, so you can be up to date when swiching devices. Easy to use and has a good phone widget to simply and quickly add new tasks.
Wunderlist is a simple to use todo list, so it doesn't have all the professional tools as other top task manager products. A calendar view is missing, as well as setting priorities.
It's a great products for quickly and easily adding tasks-todos, creating lists, subtasks, comments, due dates, sharing, etc. and having everything synced between devices, worth trying out, especially if you use different systems (iOS, Android, Windows, OSx). If you search for a more sofisticated product with reports, charts, then consider something else.
The way I can add tasks and synchronize them on all my devices solves me a lot of problems. So whenever I remember a task I grab the closest device and add it to Wunderlist not to forget. Also sharing and sending tasks by email is a great future. Sending tasks includes also all subtasks and comments, which is a future some competitor apps are lacking.