Amazing. I've been doing flat design for over 10 years and didn't realize it. I never would have believed that my unfinished Photoshop layout mockups would one day become a design trend and be sold off as "flat design". Where the design is simpler, cleaner, easier for the designer to produce, and charges the same amount of money to the client. It's basically selling less to the client at the same cost and creating an easier experience for the users. I'm not complaining, it's just interesting how design works.
These sites are beautiful. When done right, it really makes the content stand out over the containment.