i think jelly bean is amazing, i have always had great battery life with my razr maxx (and my last 2 phones, droid 1 and droid 3) if you are into rooting and such, i would recommend giving the aokp spyder nightly 6-15-2013 ROM a go. its a 4.2.2 build that is my daily driver it brought back some things that i believe that 4.1.2 jelly bean doesnt have like increasing volume for your alarms a lot of stuff you can customize to keep RAM free and such. i am also overclocked to a constant 1200 MHz and i can get a couple days out of my maxx.
I try not to pick out bad things and hate the new updates that come out because eventually i will customize enough to come to terms and enjoy it, and they usually fix them with more updates.
pretty much, you will never know if you will like it unless you try it.
and if you are not sure, like someone said a few posts earlier, if you have a friend that does have jellybean mess around with it and see if you like the feel of it.