Due to it's stellar performance I am still on Mac OS Sierra 10.12.6, so, should I pull the trigger on MAC OS High Sierra 11 and load it on my Refurbished MM(Late 2014), 8GB Ram, 256SSD?
From what I can tell HS works fine for the vast majority of users. If you avoid an update because of the whines on MR, you'll never upgrade. The complains on forums like this do not represent real world use.