I've used 10 stats since it's come out, on both my tank and my dps. I prefer it due to the extra attribute points given to agil, str, etc. But then again, those could be really worthless, I'd imagine raid buffed 10 agility isn't going to really give me a lot of dodge.
On the note of the 275 scaling with kings, I have no idea, but I think it would.
Need some help or pointers? Ask me for my vent info or for my AIM screen name. You can also hit me up in game on the server Eredar, my name is Franchize. (Horde) <3