So Far, so Good
I have an early 2011 MacBook Pro. I was concerned because some reviewers say they added memory. I have the originak 4 GB. I just downloaded El Capitan last night and it seems to be working fine so far. I saved all my documents to a flash drive, and then started. This morning when I got up it had finished I thought, but I had to enter my Apple ID password 2 more times, and then some apps needed update, which took a couple hours, and then I shut it off and back on 2 times, because something was going on with slow loading and a progress bar the first two times. Finally it opened normally. One thing I dislike greatly (as with iPhone IOS) are the cheap cartoony-looking icons. The olde ones were more elegant.
syzygy47 about
OS X El Capitan