Got a 2015 MacBook Pro 15". Runs great. Zero issues. I use it for media consumption, writing and light Photoshop work. What exactly is High Sierra going to do for my MBP that Sierra doesn't? Speed? Stability? More colorful screen? Better Internet connection? Lighter weight? Invisibility? But seriously, what am I missing out on by not upgrading? I'm baffled by the whole High Sierra update.
Today? Probably nothing you get with High Sierra will change your life one iota from what Sierra can do. Six months from now? Maybe there will be a compelling reason, perhaps a security update, perhaps a new feature. I followed the advice of Mike Bombich, from Carbon Copy Cloner, and did not upgrade immediately. I was going to wait for three or four months, but my curiosity got the better of me, especially since there did NOT seem to be an inordinate number of bug reports for such a significant structural upgrade.
I upgraded my secondary Mac Pro. Nothing really odd happened - except the four drives inside it (I booted from a PCIe-based SSD) did not mount after the supplemental upgrade. After two restarts, they mounted and have been there ever since. By the way, my biggest gripe for the last year has been how slowly Sierra is at UN-mounting external drives, but that's another story. Anyway, I then decided to upgrade the 13" Touch Bar MBP. Here, the main issue was that the NIK Photo Plugins were disabled. I had hoped those reports might be overblown, but they were correct. I love NIK and have used it for years. Still, I wasn't going to let one piece of software prevent me from upgrading. Also the people at MacPhun have a great suite that essentially replaces NIK - except for one major feature. Anyway, I then went and upgraded the 15" 2015 MBP. Same experience. I then bit the bullet and did what was probably stupid - I upgraded the 2012 Mac Pro, my major work hog and definitely not a stock machine. I made sure I had an Apple-blessed GPU in there and I unhooked all peripherals. It went well. Firmware upgrade, software upgrade. It all works, except for Nik. I have not tried the old Final Cut Pro, but I keep a legacy drive with 10.8.4 on it for old FCP projects. I now also keep an OWC Accelsior blade mounted with Sierra, with CS6 and the Nik plugins, just in case I want to use them. I may not use it much, but it's there.
Anyway, what do you get? Not much. What do I get? I have to be thinking ahead. I maintain other peoples' machines, as well as my own, and I want to be up to date. I have called the updates and when I install them on an individual basis, going back to OS6. I'll continue to do that. I have NOT converted my eSATA boxes and other assorted external drives and boxes to APFS yet and don't plan to for a bit. Just the boot drives. So far, so good. I'll get around to that in a little while, once I'm sure I can trust the new file system with my data.