About two weeks ago I got a new Dell laptop at work. I upgraded from a D800 to a D620 and damn it is fast.
Right now I am building some virtual machines to do some automated patch-application testing this this thing run XP in a VM (VS2004) faster then my D800 ran then native. Amazing!
The only problems I have seen are a stubborn docking bar (I have to push harder then I think I should to dock) and a problem hibernating. I am working through the docking problem and the hibernation problem was fixed by an XP hotfix (needed on systems with > 1GB of RAM).