I have a 256 Gb i7 model with 4 Gb RAM without fan problems, at full load with the free antivirus option for a month I have some noise but I change it and no more. It's possible to have some troubles of stability in a hotel if the wifi is with web logging, the connection frequent irregular and you have select to keep it , you can fix un-selecting keep option.
The flex is not a problem. Keyboard is hardly noticeable and a bit more smaller that others but after two days is definitely not affecting the typing experience and you feel keyboard is really great.
About bad points, The multi-touch gestures on the touch pad for some persons (not me) with big fingers doesn't work propperly but in this case you can use the screen.
It's difficult to find a good case and the Sony one it's expensive and heavy, after many tested I bought a 10.2 inch of targus and a bag fron Tucano ( it's for MacBook Air 11" but works fine)
Overall it's probably the best 11 inch windows 8 device with great looking and if you want to be fluent in windows 8 netbook you best option. The W8 only have two options for a good experience, a tablet or a 11 inch device, because with a bigger device the screen it's to far.