I love ToDo!
However, on the Mac client I have a few annoyances.
Undo is broken inside the edit task dialog. Clicking undo while editing a note for a to do item actually undos something in the background -- not good.
Also, when I paste a note in the box, it takes all of the text's formatting with it. I can't "paste and match style" -- which means I have to copy it to a plain text editor first. If you accidentally paste something with special fonts, it takes a while to find out how to change those fonts (by right clicking).
Lastly, clicking a star doesn't unstar an item.
I feel like perhaps Todo on Mac isn't given as much attention as the iOS versions. But, I still like it.
When editing the body of the task, when I select the return key to jump to a new line, it automatically ends the edit session instead of allowing me to add an additional line. Any ideas?