I was, unfortunately, an "Early Adopter" of El Capitan. Fortunately, nearly everything works.
TechTool Pro 8 does not work, but I am sure they will fix it soon. I'm keeping Yosemite on a bootable external drive so I can use TTP when necessary.
And what happened to "Secure Empty Trash?" I was in the habit of always using it to empty my trash.
Printing may be a little slower, though I cannot document that.
Oh,well. Looking forward to the next iteration.
Joe