I've been using Amazing Marvin for a month, and I was in the same boat of having tried many, many apps, none of which stuck. Marvin just feels right. The day planning approach has made me feel much more in control, and it helps me get more done. You can pick and choose features (strategies) and build your own perfect app, basically.
In the world of todo apps, AM is a far superior approach than anything else I've tried. I'll happily vouch for it.