We're in the process of evaluating new systems, including one new laptop.  I was originally leaning towards the Dell M6400, but after talking with Lenovo I'm willing to give them a shot also.  That being said, it's always nice to hear some real world cases with it.  Unfortunately, the extra slide out screen is on the right hand side which is not condusive to SolidWorks, but great for reference material.  It does have some interesting other features if you want them, like the optional built in wacom tablet and pen.

Anyone have one yet?