I also got rid of the lte Evo due to multitasking issues and connectivity issues. went through 3 of them.
I have had the gs3 for 2 weeks now and love it. Multitasking works excellent and connectivity is great too. Gps also locks fast.
Browser, Touchwiz, and keyboard stink. Replaced them with, Apex launcher, SwiftKey, and Firefox Beta. All is excellent now.
Battery and camera are both excellent! Plus having a menu button is perfect.
At first I was not fond of the punchy colors, but I love it now.