I'm guessing most of those screenshots are limited screen on time or extended batteries? The best I can typically do is 16h+ with about 3.5 hours screen on time.
I just installed Juice Defender Ultimate and I am waiting to see if that makes any difference.
For me if the tweak or method limits the phone's functionality then I won't do it. I bought a, "Smartphone" for it to be a Smartphone, not a brick I carry in my pocket until I turn it on.
I had pretty good success with Juice Defender Ultimate on my Epic, but I wanted to try the SGS3 with nothing to get a baseline on whether it actually offered improvement. I will report back.