So this glyph is a must have in my opinion. I absolutely love being able to keep dpsing in situations where I am being thrown all over the map. Combined with Fulmination, this is just amazing.
Specifically I am thinking of scenarios like Siamat in the Lost City of the Tol'vir. Between Phase 1 and 2, you get tossed in the air a bunch and potentially knocked off of the platform you are on. Everyone else stops DPSing. With Glyph of Unleashed Lightning you don't.
That my good friends, is awesome.