Sierra is still running well on both my MBP and Mac Mini so won't be upgrading just yet. Plus there are a couple of pieces of software I use that still aren't compatible with High Sierra. Whilst this is not Apple's fault (tardy developers), I thought that High Sierra was an incremental upgrade to Sierra but there are significant enough changes that it breaks some drivers and software. Stability is critical for me as I use a program called MainStage for live music performance, so won't be upgrading for at least a couple of dot releases.