(1) Less UI clutter, (2) instant response time, (3) automatic Bluetooth sync with my phone, (4) offline ability (I live in Thailand and my internet connection is not 100% reliable), (5) an easy way to get stuff from my email to my TODO list, and (6) instantly-responding UI.
I like a lot of things about Nozbe.com but it is too slow and I cannot do anything with it using my phone. Also, the fact that you will have to pay according to how many "projects" you have is crazy.
