I do and don't. By day I'm a Linux admin - RHCE in RHEL4/5/6 and admin about 600 Linux servers. So I know a thing or 2 about it. It is absolutely awesome for servers and ensuring that systems are the same. Windows can only dream about being as good as Linux in that respect. (I say that as a previous Windows admin from NT to 2003 on the server side and 95-XP in on the Desktop side.)
But for personal use I don't want to tweak it, I want it and my perhiperals to work. I want my graphics to look great, have apps that look great and want my hardware to work. So I use OS X. It's UNIX under the hood (BSD) with the app and hardware integration that is second to none. Period, end of story. My Macbook Air runs for months without a reboot, sleeps and wakes without issue, connects to all sorts of WiFI and perhiperals, etc. I pay a little more for that but in return I get machines with long life, super battery power and speed. I don't dabble in the low end garbage of the PC world so the pricing is about the same as a mid level Windows Machine.
If you want to play with Linux, Mint or Ubuntu are good choices for the beginner.
If you are tired of Windows' nonsense and want ease of use just pony up the $ for a Mac - be it new or used. You most likely won't regret it.