i've had mine for a couple of days now. Clevo definately did their engineering work on this one, it is a lot better than the 4780.
it is quieter, and nothing in it heats up as much either. You'll recall 4780 users had problems with the left hand side of the keyboard getting very hot, this is definately solved.
The only two things I can pick up as possible problems are that the ram fan is quite loud, it sort of buzzes, and that the hard drives get very warm.
The rest of the notebook is perfect. The colour change to dark grey works really well, the entire notebook looks very professional. It seems to be a little more resistant to finger prints as well. Everyone who has seen it so far wants to buy it straight away.
make sure you always keep the bigger cpu fan free to breathe, it also cools the northbridge and the graphics card. I tried blocking this fan and letting the smaller fan handle the cpu temperature. The cpu stayed cool enough, but the entire keyboard became very hot.
The overall feature set is just amazing, I can't imagine anyone buying any other desktop replacement clevo now, this notebook is just stunning. (excluding budget reasons).