I've just recently moved from Windows 7 to Linux Mint 17.3. I'm not a fan of the Windows 8.1 / 10 interface, and with all the telemetry being added, decided it was time to move, since MS are REALLY pushing windows 10. I have a Laptop with Vista, but i'm Probably going to move that to Linux too, but only if I can get all my car diagnostics stuff to work in Linux. I also run a machine with XP too, its just next to my electronics desk for looking up stuff etc when I'm working on things. I'll probably be here more often now i've made the jump. :-)

Desktop & Laptop: Kubuntu 14.04 LTS

Debian Jessie Xfce
Win 10 for games

Linux Mint 17.3 Cinnamon.

Ubuntu 14.04

Desktop machine:
Primary system is Fedora 23
Secondary is Manjaro
A third is the partitions where I like to experiment, currently Debian Jessie.

An old Acer Netbook is my carry around machine, it runs Manjaro as the primary system and Peppermint 6 as the secondary.

All the OS have several Desktops installed, Gnome, Plasma, xfce and so on.

I've been using Linux Mint almost exclusively since 2014, and currently run Linux Mint 17 with the Mate` Desktop. It is lean, solid, trouble free, and the upgrades, especially since LM 17, are a snap.
I still like to test other distributions just to follow what's going on around me, such as the Ubuntu-MATE, Fedora, and OpenSUSE. That said, I much prefer Linux Mint for its ease of install/upgrades, the update manager, and its overall stability and reliability.
Though it is touted as being best for beginners to Linux, which it is, it is also excellent for those of us who no longer have the time or inclination to try to "fix" broken releases, but just want a reliable box to use, day-in, day-out.

Linux - Opensuse 13.2

Windows 10

I am using Xubuntu on two machines, one of which is dual-booted with Windows 10. I use Windows 10 just enough to keep it updated and for a couple of games.

Netrunner 14

Win 7 on a $109 notebook.

Mint 17.3 KDE on my laptop.

Assorted Linux systems on spare hard drive attached to a desktop

Riscos

Linux Mint

Win7/Mageia dual boot on the graphics tablet (spend most of my time in Mageia), Slackware on the desktop, Mint on the laptop.

Debian (main)
aux:
Win10
Mint
Ubuntu
Fedora

all using CL & Mate (except Win10 Mate obviously) - hey maybe with the Ubuntu Bash version I could run Mate on Windows?