I bought my first Mac today after following MSFT from Windows 3.11 to 7. Laptop died today and after much hurried research, really wanting to avoid having to make the switch right now, I kept finding that almost every PC laptop had quality control issues. You have to look into the user reviews, not editorial reviews. Almost every ultrabook had trackpad complaints, especially the Samsung Series 9, which is a shame, because it's a beautiful machine otherwise. PC manufacturers can't seem to get their act together (or maybe they don't want to bother because no matter what they do Apple will always be considered superior quality by the consumer?)
Anyways, I'm happy with the switch so far but I think I'll always feel at "home" with Windows, given that I've been using it every day since I was 8 years old.
While I find this option very attractive from what I've read the drivers aren't very well optimised for Windows and battery life in particular takes a rapid nose dive on Windows Vs. OSX.
I mean a Macbook Pro has better battery life than a Thinkpad Txx with a 6 cell battery (worse than 9 cell) but if you put Windows on the Macbook Pro instead of OS X then the reverse is true (@ 6 cell).
Your battery life will suck, but IMHO, Macbooks are still the best Windows laptops you can buy (but avoid the rMBP, since high res is troublesome under Windows).
Anyways, I'm happy with the switch so far but I think I'll always feel at "home" with Windows, given that I've been using it every day since I was 8 years old.