I read 13-15 this afternoon - wow, good stuff. Very highly recommended.
We're all here because we read and love the Ultimate books - Supreme Power is as Ultimate as it gets without having "Ultimate" in the title. It's a MAX title and has some mature themes, but for anyone old enough to buy them, you should be picking this up.
The writing with the team coming together as mentioned earlier is great. In fact, I'm thinking back to New Avengers #3 which I read a couple days ago, and I honestly thik the team dynamic and the coming together of the team members is better than NA - and NA is my favorite book.