I use a mac but the iCal sync is useless to me because I use Toodledo's online service, so I need an iPhone Todo app that will sync with that, this limits my choice dramatically. After reading this review it did sound and look like a well polished app so I checked their site and was delighted to find that they have updated it with Toodledo support. Up until now I've been either using Toodledo's own app which to be honest has a very poor UI and feature set, or ToDo by Appigo, much better UI but poorly lacking in push reminder options (it's either all or nothing at one preset time). 2do blows both these apps out of the water in all regards. I'm very delighted to have found this review and now feel that I have a todo app which does everything I need.