Hi, I purchased an iMac 27 5K back in November with a 500GB SSD, and I was wondering if I should “upgrade” to High Sierra? Are there any known issues that come about from doing that (slowdown, software compatability, glitches, etc)? Currently, the computer runs fine on Sierra, but I was wondering if I am compromising safety or anything like that by choosing not to upgrade? Any game changing features I should be aware of? Other than the new files system which I am interested in, but don't quite understand fully I mean. Thanks in advance for any help!