I need a monster sized notebook for a big project coming up at work. Gotta have a 17", and its unlikely the company will buy anything other than Dell.

Anyone have experience with these large Dells? Specifically we're looking at an M90, but there are a number of models that are similar. Any kind of feedback would be appreciated.

Specifically curious as to battery life. There could be circumstances where I would need to use it for close to three hours straight, with a Sprint cellular card. Is it doable?