I have a dozen friends using Linux Mint KDE 64 Bit. They are very happy with it. The updates are easy and the system is solid. All were ex-Windows users and it was easy for them to convert over to Linux.
It was easy for them because I installed the OS for them. It is an easy install and much easier than any Windows install I have done. Only a personal password is required and NO authentication is required.
The beauty of Linux Mint is that I can instal the complete OS with all the important applications on one hard drive and then duplicate that hard drive for other computers. All of the necessary drivers are built in. Linux Mint finds the wireless hardware almost automatically and is a snap to setup. (Try that with Windows and the included wireless setup CD)
Also going from Linux Mint KDE 17 to 17.3 is as easy as one click of the Update Manager. The Update Manager automatically checks for updates and does NOT bug you with Pop Ups. The manager icon merely puts a blue dot in its icon's center when an update is avaliable.
I am sure happy I cut the ties with Microsoft a year and a half ago.
Here is a link if you are interested in trying Linux Mint 17.3 "Rosa" KDE version.
Good Hunting... from Varmint Al