I've sat up there a lot. The view is distant. You're really high up and really far back. You won't see faces at all, but you get a good sense of the whole stage picture. It is a bit like watching a miniature theatre.
But the sound is quite wonderful. You're close to the ceiling so you're close to a reflection so it's good, vibrant sound. I actually like the sound better up there than I do too close to the stage since the sound can naturally blend in the space.
I sometimes splurge and get the balcony boxes if they're available. You're a level lower and a lot closer to the stage. It's a weird vantage point - a third of the stage is cut off from view and you're at an odd angle. But the sound is good and the price isn't too bad - the closer you are to the stage, the more of it will be cut off so that's the trade off.