I've had my 12" rMacbook for about 2 weeks now. I have put it through it's paces with multi-tasking, running processor intensive apps, Safari with Flash, and I am so thoroughly impressed at how well this device can keep up with what I am throwing at it. I was really skeptical when I bought it on whether I was going to keep it, or go back to my 13" rMacbook Pro. My decision has definitely been made (Spoiler alert, I'm keeping it). Today I think I did more on it then I have so far and where my Macbook Pro would be pretty hot at this point with fans running, this is slightly warm. Just an observation that really impressed me that I figured I'd throw out there.