I heard a lot of people saying, "No glance, no deal," type stuff when icon came out. I am on my first phone with glance and it is kinda pointless to me.
It depends on the phone itself. Some have partial Glance and others have full Glance. At a minimum, it tells the time, if you have any alarms and/or quiet hours set, vibration, and your volume settings (if your ringer or phone is on silent). It also shows a couple of notifications for email, missed phone calls, new texts, and apps that you can select to show the status, such as Skype or WhatsApp.
It shows all of that on a black screen, and you can see that without unlocking the phone itself. Full Glance is the same, but I believe you can add Weather and a background to it, if you wanted.
Let me say first off, I'm a huge Glance fan. Love it, have depended on it.
But now with Band it isn't so much of a do or die. Band extends Glance functionality out. Makes my Glance-less BLU Win HD LTE more tolerable if I set my Glance-enabled 1520 aside.
Coming from BlackBerry, I miss the notification LED, having a phone that displays notifications with Glance is something I want too, glad to see the 950/950XL feature it.
I had Glance for the brief couple of months that I was using a Lumia 822. Then I got the Icon. And man, do I miss Glance. Glance is such a simple, but convenient feature. I wish i had it.