I've had past experience with an Alienware M14x and it performed very well for all but the most hardware intensive games.
Pros: - Design was surprisingly sleek and aesthetically pleasing - Build quality was spectacular - Outperformed like a champ in most games barring benchmarkers like Crysis 3 and Metro - Feature packed (SD card reader, webcam, mic, HDMI out, superb audio quality, back-lit keyboard, glossy 1080p display, etc.) - Remained cool to the touch under load
Cons: - Battery life was absolutely abysmal if you were trying to game off it - Only had one blower type fan on the rear so it could and would get pretty loud - Sleek as it was the thing weighed as much as your average textbook and was not fun to have seated directly on your lap
ADD, no. Where is the thread for Fallout OCD players? "We have to keep it on page 3 or it freaks out."