I'm awaiting delivery of my first Mac and this was one of the many factors that convinced me. I have a fairly decent laptop (Dell L701X; i7, SSD, 16GB ram, 3GB graphics) and it runs windows 7/8 fast! Startup is about 20-30s and I'm off and away in no time, particularly in windows 8 which now has intelligent startup which loads what your trying to use first. Anyway, a couple of months ago, my girlfriend 2009 Macbook needed a hard drive upgrade, she'd filled the desktop with millions of pictures and couldn't store anymore, so she asked me to do it. Before removing her current drive to clone, I asked her (seeing as I'm a Mac novice), how do you shut the Mac down? Her response, yelled from afar - SHUT THE LID! - she had never, in the 4 years of ownership, shut the thing down properly and it was still running smooth with no problems. If I tried this on my windows laptop, I think it would self destruct within a month.
The second big clincher for me was the customer service received with my iPhone, iPad and girlfriends macbook. They just seem to replace faulty goods in an instant and I'm happy to pay a little more for such a privilege.
Having half decided to buy a Mac, I wanted to test it out a little before making such a huge investment so installed iAtkos ML in a virtual machine and used it for everyday tasks for about a week. Though not ideal, due to VM restrictions I liked the environment and had not problems with my general usage. I've now installed rocket dock on my Laptop and moved the task bar to the top of the screen because I missed OS X so much!
If you are really new to OS X and not sure if you could live with it, try installing it in VM ware, or similar. I'm not sure doing so is completely legal but I didn't worry too much as I was only using it for a couple of weeks. Helped me understand the environment and convinced me to buy a rMBP to run alongside my Dell XPS.