Sony VPCZ21C5E

compact but with all the bits and powerful

nil

Everything. The screen lasted four months. I sent it back and they bent the body putting in a lower resolution version. Steer clear of Vaio

Very good battery life, lightweighht and powerful especially when connected to the media dock

Limited usb ports and the media dock one is intermittently reliable with usb3 devices

Good, fast, stylish, light, great screen, reliable, good support from Sony

Consumes battery prolifically at anything other than minimum settings and so is always a bit more of a compromise than I'd actually like, but then I get small form factor with a smaller battery so I guess it's my choice really...

Size, weight, screen (hi res one) speed.

Cost and screen a little flimsy.

The "Shift" key is very small - much smaller than all other keyboards I have ever seen (including previous Sony keyboards). This is annoying because my natural strokes on a keyboard result in an incorrect key being hit.