It's awesome. Wait for the page to completely load - if the book icon in the address bar goes from light gray to black, click and enjoy. It makes the text larger, removes sidebars and ads, etc. For things like forums, it can make it a confusing mess, but for typical reading, it's nice.

The Hello camera is cool because it utilizes three cameras (more stuff to break! But still...), including one IR cam, so it can be used even in a dark room while retaining an almost instant response. It's also three-dimensional, so no fooling it with pictures like you could on the face unlock on Android phones a little while back (not even identical twins have been able to fool it).