I use Linux a lot, mostly on 4+ year old laptops with (by now) fairly well-supported hardware when I think something like Xubuntu would outperform Windows 7. However, there is the occasional issue of a WiFi chipset not being supported out of the box, usually easily remedied by using something like an "install third-party drivers" option while hooked up to Ethernet (which always seems to work for me.)
However, I've got a newer laptop here with some (probably) less-well supported hardware, Alienware with a hybrid nVidia/Intel video chipset. I'm going to download one distro (Fedora, probably not the friendliest one to start with) and give it 10 minutes to see if I can get it running well enough to be a daily driver. Lets see what happens.