Anybody heard of ToodleDo?...or for that matter, what about Ta-da List, Todoist, Nozbe, voo2do, or Vitalist? (found out about all those through toodledo's software comparison chart)

I read through the features that ToodleDo has and it looks pretty amazing, I wanted to know what you guys thought of it and see if anybody over here was using it or had tried it but didn't like it, etc.?

I am very interested in knowing your opinions, thanks!

comparison to other software:
http://www.toodledo.com/info/compare.php

list of features:
http://www.toodledo.com/info/details.php#customization