So after using DoIt for awhile, I'm still a bit torn on it.

Things I like:

The layering of levels (context/goal/project/to-do)
The easy someday/waiting/scheduled designations
Cost (not gonna lie, the price is a factor for me)
Easy moving of items across projects, since I have several "stage bucket" projects.
Easy moving of things out of today and into tomorrow, for end of day review

Things I hate:

Tags are all but useless. If I can't control-click multiple tags, I can't filter. Which really limits things for me, because I definitely can and do want to filter for more than one tag on an action (like, say, "2014 book" and "comp")
Inability to have true sequential review as looking at "next" shows all next in a project
Editing a task is annoying and clunky, which means collecting items to process is longer than it should be
Color-coded priority isn't working for me to do clean reviews

I'm not sure where that leaves me right now. I poked at Zendone again, but I still can't stand the interface and the site I left is kinda run by jerks, apparently, even if they *do* keep it together.