[rtpg]

Omnifocus basically solves almost all complaints people have with Todo apps. You have to spend time on it, and that's because "Todo lists" are project management, but people don't see it as such.

Some people have "weird requirements" and even those can be gotten right thanks to very good configurable searches and views. The competition is miles behind Omnifocus (I think the fact it started as a local app and not a web app helps, cuz you're not worrying about "heavy queries" or whatnot)