I have recently got rid of my mbp in favour of a dell xps 15, why?
Programs I run are significantly quicker in windows than OSX (lightroom and DXO)
The dell screen is better (1080p full adobe gamut)
It was £700 on dell outlet (quad 1.86, 4gig, 500gig, 1080p RGBLED, 9 cell battery) – which is well over half the price of an equivalent mpb, even with nus discount!
Saying that am a huge fan of apple hardware – we have 2 apples and one dell + an acer server at home, yes it is expensive, but extremely high quality, and resale value is way better than anything else (thank you mac fanboys!)