I've always wanted a nice secure Linux laptop to work on but I'm not eager to waste hours upon hours getting the drivers to behave (my experience with Linux on the desktop is a bit dated).
The things you have to watch out for are: * Use an up to date distro with an up to date kernel (e.g. Fedora) * Graphics are the only real driver issue. Easiest solution is to buy something with integrated Intel, but some cards are well supported, you just need to check * Battery life will be worse compared to Windows on a machine normally sold for Windows. This situation may be better on things designed for Linux, like Dell Sputnik stuff and Purism, but I have less experience with them