Very good to-do app

I use lists constantly to keep myself organized. I have gone through several notes apps. This is one of the best. The interface is simple and clean; easy to use. You can choose to have one gigantic list or break it up into multiple lists. I love the ability to quickly push your list items to tomorrow or upcoming, but you also have the ability to schedule an item for a particular day. It syncs beautifully across all of my devices (iPhone, iPad, MacBook)!
I haven't used the Pro version so can't comment on that. Sharing a list without Pro requires the other person to download the app too, which they don't always want to do. Would be nice to be able to just email a list to someone (perhaps that is a Pro feature). Anyway, overall this is my to-do list of choice. I love it.