My consistent practice is not to upgrade operating systems unless it becomes necessary - i.e. because programs I use require the upgrade. I have been using Macs for well over 30 years now and have very little need for the bells and whistles in the operating system other than to reliably open and run programs, print etc. It may be that I overly cautious but over the years I have found myself with all kinds of problems with upgrades.
However recently the Finder on my iMac 5k running 10.11.6 keeps hanging requiring a restart. Googling this problem it seems I am not alone and there is no simple solution. So I thought I would bite the bullet and think about upgrading to Sierra to see if that helped. I have a pretty modest number of programs I rely upon - LR - CC, a little bit of Photoshop CC, FCPX and the usual word processing, mail programs and a lot of web searching/browsing through Safari (which I still prefer) or Chrome.
Critical is printing from LR to an Epson 3880 with a range of presets and profiles which work fine with 10.11.6.
Anyone got any thoughts on whether it is safe to go down this route?