As a longtime OmniFocus user, I'm appreciating the visual simplicity, the ability to enter non-task objects easily, and the ability to assign and share tasks between users. I appreciate that it works in the 'pro-users and pro-teams' model used by software that crosses the professional and personal divide.
It's still definitely a 1.0, as I'm encountering small missing features and hiccups that might be 1.0 UI or might be bugs. But those are small compared to the ease of use, and I'm sticking around to see where it goes next!