This build is mainly for gaming, but also for CAD work and simulations (I'm a university student). I was fed up of playing games on my laptop with a GT555M and a processor that runs at 95 °C when gaming.
During typical use, the computer is practically silent and sits at about 25-30 °C.
I did have a few issues during the build though. The PSU had to be forced against the bottom of the case in order to get the screws in and one of the screw holes doesn't match with the case. I also found that the HDD trays are quite easy to accidentally pop out when I was sorting the cables behind.
I also have a RAID0 with 2 WD Scorpio Blue 500 GB 2.5 inch HDDs that I had from previous laptops - it seems to work fairly well as a place to store my game installs.