I used Toodledo as a Pro and Pro Plus user since June 2009 and I was always very satisfied with the web page. But two weeks ago I stumbled across Todoist and to my surprise I'm very enthusiastic about it. Especially because it has a very simple design, it has most of the features Toodledo is offering, it's cross-platform and they have an excellent Android app!
In particular the missing Android app is the reason why I'm leaving Toodledo, because it simply hampers my workflow.
Nevertheless, thanks for the last 4 years and I wish you all the best for the future.