I've been using a Dell XPS 15z for the last three years, comping from an MBP and it has been a relief so far on a lot of points: reliability, drivers, support. I probably had a non-exemplary extremely bad experience with Apple and AppleCare but it was enough to say 'thanks but never again' (mobo replaced twice, swollen battery, OSX actually gave gray screens more then windows gave blue screens on that machine, completely dead in the end - of course right after the extended AppleCare expired, people working in the local Apple store seemed to have been trained to behave like assholes). Again anecdotal but had none of such problems with Dell. So far.