I think ultimately Linux Mint made me switch to 100% Linux six months ago. I never looked back! I had used Windows Vista Home Premium on my old laptop for about 4 - 5 years, but tried a distro now and then using VirtualBox. At work I'm a server administrator and we use Ubuntu so I got very familiar with that. When I bought my new laptop last year, it came pre-installed with Windows 7 Home Premium. I had to make a few adjustments to some of the changes in the file manager, and other small things, but overall it was much like Vista. Just on a better machine. Then Windows 8 came out and I decided to spring for the $15 upgrade to Windows 8 pro (which the computer manufacturer then reimbursed me for). I tried. I really really tried. But no matter what, Windows 8 became useless as far as trying to get an real work done. I found I had to spend MORE money to get back a start button (free versions didn't work as well as I needed them to) and boot directly to the desktop. Plus in the back of my mind, I knew the system resources were being hogged a little by that darn "Metro" or "Modern" tile start screen. What a waste. Not only that, the Windows looked so ugly I hated to use the computer! Seriously looked like Windows 1.0 on steroids! Sick. And at the time nothing could be done about it (Stardock since has come out with Windows 8 version of WindowBlinds but that's commercial software).
What tipped it was Microsoft. Back in October or November I had decided to let go of my hotmail account and wanted it closed, cancelled, since they were phasing it out anyway. They said sometime in November it would be gone. Well, it didn't happen. It took several MONTHS to get that and another Microsoft account that I had started when using Windows 8 to completely close. TONS and tons of emails, and one representative thinking she'll call the cops on me for wanting to go to the attorney general because they refused to delete my private data and close accounts! Needless to say I couldn't control my laughter when she said that. An advocate did apologize for her behavior but still, it took several people and a few months to close those accounts!
Well, by January, I had enough of Microsoft (They were STILL trying to close those accounts!) altogether and after a few weeks of running Mint 14 in VirtualBox within Windows 8, and testing for hardware compatibility, etc. I took the plunge. Everything worked! Most of it out of the box! I did have to do some adjusting to doing things a little differently but it wasn't too bad at all. And I was already well familiar with the command line when I needed it.
I chose KDE because I've used KDE on different Distros in the past and always loved it. It is most similar to Windows (yes, it's not like Windows but it's closer) and I like the window decorations. You can customize it any way you want. Plus there are some good plasma widgets.
So Linux Mint and Windows 8 made me switch. Windows 8 because it just was terrible and expensive and Linux Mint because it was much more stable, boots up fast and is easy to use. And it's not a resource hog running things I don't want/need in the background with no way to get rid of it (Like Windows 8 start screen).
I had tried to move to Linux before, using distros like Mandriva (before it was even called that), and Slackware. I also tried I think Red Hat and also various versions of Ubuntu (including 12.04 Desktop) But in everyday use, neither would do what I needed to and some things seemed to take a lot of work to get working. I don't know but Mint just seemed so much easier to set up.
So that's my story. I think Microsoft royally jumped the shark with Windows 8. I read now and then that it's doing very poorly. I don't worry - I have something better now.