I got an 11-inch Asus UX21E to replace my heavy, battery-hog 17-inch HP monster. I chose it for two reasons:

1. It's really, really light, I can carry it in one hand or in my Muji manbag. And it's a PC.

2. It's an i5, so while it's fast enough for web and email, the limitations of CPU and GPU power keep me honest as a client-side coder.

Six months on, I can't fault it. I'll upgrade when DX11 GPU's become available, but for now it's perfect. If I needed a Mac, I'd get an Air, but I need a PC: I can't imagine ever going back to a full-fat laptop, and tablets are simply not for C++ coders, end of story.