I'm just a casual user - and I'm VERY LUCKY to have my computer back in operational condition. Yeah, I have my fun - the whole tongue-in-cheek "Apple sucks since Steve Jobs died" bit. But, until now, I was kidding. Not anymore - not after High Sierra. I have no clue WHAT they're smokin' - but trust me, kids, you do NOT want any. Seriously bad stuff. I have NO CLUE what's wrong with High Sierra. I'm not a techie. And so the techies can probably explain what I did wrong. But, in this case, it seems there are quite a few that would agree that what I did wrong was to TRUST Apple and install the piece of garbage in the first place. No, it didn't completely tank my late 2013 Retina MacBook Pro. It just slowed everything way down and glitched and sputtered - it was just a terrible user experience. So HEY - NO PROBLEM! - I can just downgrade. Certainly that should work, yeah? My own stupidity for installing Apple's new public betas that are now released as "Golden Masters" or whatnot - right? I'm an IDIOT - all on me. Yep, yep. My bad. Okay, then let's DOWNGRADE - in my case, back to El Capitan, because I had no need for Siri on my laptop. Sorry, it was called Sierra. My bad again. Anyway, BACK to El Capitan for me. I'm not a COMPLETE IDIOT? Oh, I SO am. I performed a TIME MACHINE BACKUP right before installing High Sierra. So, I'll just restore from that pristine copy - no worries. Apple's got my back - I followed their instructions. I'm not a COMPLETE MORON? Yep, turns out I am. Apple only allows ONE Time Machine Backup, and my trusty Mac didn't burp out any warnings or relate any failures. Nope - it just... FAILED. COMPLETELY. Little red exclamation points next to all my directories. So I looked that up - apparently, we TRUST Time Machine to save us, but... NO no no no no... Tons of advice on how to implement Time Machine - zip on what to do when it fails. It's just good practice I suppose to waste my time doing Time Machine backups? GRAAAHHHHRRRRRR!!!!!!!!! Oh, I HATE Apple at this point... and especially Bean Counter Tim and Poor Fumbling Craig Fedher-Star Trek Alien. Before - I felt sorry for THEM - what with them having to live up to the standard Steve set, and failing so horribly miserably - but now... Okay - not stepping into a full on rant. Luckily for me, I'd questioned Apple enough to use Carbon Copy Cloner - which is the ONLY REASON I was able to restore my Mac. I just can't BELIEVE how HORRIBLE an experience I just went through - And, of course, no one SHOULD care about my idiotic problems with my Mac. But - if you were planning on MAYBE installing High Sierra over the weekend - because hey, it's the weekend - I'm not in the position to advise anyone, but... DO NOT DO IT. And, if anyone cares to read this and might explain to me why I should EVER even use Time Machine EVER again - please enlighten me? When I needed it to WORK - it FAILED on me. So no - I won't be trusting Tim and Craig to unleash APFS (Apple's Piece of F** S**) file system on my Mac where I actually NEED to access my files. Same goes for their new Video and Photo formats. Nope - don't trust those... Apple Geniuses. That is my story. If you choose to venture forth into High Sierra - I wish you better luck. I'm done trusting Apple for now - as far as I'm concerned, they're just forever out of a Jobs.