4 years with an iMac.
Zero problems.
Linux Mint 17.1 “Rebeca” just upgraded.
Sweetest OS I have ever used. And I have MacOSX, XP, 7, 8.1 (blah). The Linux and 3 windoze boxes are on a kvm switch.
The Linux box running on half the hardware of the windoze boxes, does circles around them. No problems with malware either. It is literally the sweetest OS I have ever used.