I love Google Now, so I will probably like this as well. However, one thing I start worrying about more as I come to rely more on such tools is: what is the chance to miss something important? What is relevant is picked based on heuristics and statistical models, and it might miss things that I consider to be very important.
Obviously, human errors occur in a more traditional approach where you use an e-mail client, calendar, and todo application. However, it would be interesting to see how accurate such machine-learned approaches are, compared to manual methods for information management.
I've been using Inbox and you won't miss anything. The auto-surfacing is really not as aggressive as you might imagine. If you just use Inbox without changing any settings you basically just get a cool GMail UI with the addition of 'Done' or 'Remind me Later' on each message.
Obviously, human errors occur in a more traditional approach where you use an e-mail client, calendar, and todo application. However, it would be interesting to see how accurate such machine-learned approaches are, compared to manual methods for information management.