I am currently running a Dell M90. It is the laptop before the new M series. I have it completely maxed out and it is a beast. I have thrown everything at it and have not had one issue. It is incredibly fast. It have a quadro card in it at 512mb and makes a work of difference. My only complaint is my back....with the brick of a charging cord it weighs in at over 14lbs! Now add in all the other stuff I carry (magazines, mouse, graphics tablet, etc.) and it is ALOT to lug around. is it worth it? YES, it is just a powerful as most high end desktops. Make sure you get a good backpack or briefcase that will hold a 17" laptop (not a lot of choices). I opted for a backpack as it is a little easier to fit more crap in it;)
Scott