Just picked one up at the MS store in Vancouver - said it's the first one they've sold and that it only just came in. Really impressed with it so far - made of tempered glass - feels incredibly premium, and when on the device it literally feels just like you're touching the actual screen. Also comes with a really nice MS branded cleaning cloth. You really have to see it in action to appreciate it though, I've never seen a screen protector of such high quality. It also has small cut-outs in the bottom ensuring the magnet type cover isn't affected (kind of annoying as I have the power cover though).
Also, while it's decently thick, it doesn't seem to affect touch, and don't notice any difference when using the pen on it, which is the only thing I was worried about.
They install it for you if you want - installed mine perfectly, no dust or anything - and said if anything shows up or it slides around at all after my SP3 has spent a few days in the folio they'll replace it (don't see that happening though, this thing ain't coming off).
Don't have my phone on me so can just take a pic with the SP3 of the box.
One negative though...
It costs $50. Personally I think it's well worth it, but you'll have to decide for yourself as it's pretty much the price of a premium case