I'm going for the Unified Apple Developer Membership, at the moment the purpose is just to get 10.11 El Capitan as an early adopter - mostly for general performance reasons - Accordance is not going to run slow no matter what I would do or wouldn't do but the computer is a bit old (oldest still supported advanced one), basically all parts have been changed in it so it will still last long even though I bought it recently used. I wrote on my twitter and facebook that I bought parts and on my facebook timeline I specified a little bit about my Mac. (This evening I need to decide what batteries to order so that I would be prepare for long car and train distances, as a passenger that is. Any ideas, best strategies? I have all kinds of laptops.)
Apple states on their homepage as introductory information that OS X 10.11 El Capitan gives significant performance boosts compared to 10.10 Yosemite. So I draw the conclusion that there is no more need to go back to 10.9 Mavericks which was the previous OS with good performance on old hardware.
Only drawback with my old Mac is small graphics memory.
A modern and well performing OS (10.11) that speeds up the computer should theoretically save battery as the system requirements are basically exactly the same as for the previous one (10.10).
I can't see much reasons to subscribe to the membership more than the one year that costs $99. I might take some programming class in the Spring semester 2016, I have time to decide on that and see how other (mostly language) things progress.
Related: on an entirely different forum I asked a programming question but didn't get a reply yet: http://www.christian.../#post-68109202
I'll let You all continue this thread continue as a general excitement about the new OS!
EDIT after three minutes: typo, small additions.
Edited by Unix, 15 June 2015 - 03:45 PM.