My wife & I bought 2 identical MAXXs spring 2012. My wife's MAXXs is now a complete POS due to her unwittingly accepting the ICS update. She hates it & based on that experience, she's now fighting off the JB update.
Based on her experience (& after seeing how others had suffered), I fought off ICS starting back in July. I called & emailed Verizon several times. Eventually, I quit receiving upgrade prompts. So, maybe Verizon marked me as 'do not upgrade' ? I haven't had any upgrade prompts since then.
End result is mine is the still the original unmolested GB MAXX & its great.
Mine still has astounding batt life (>3+ days in standby - ~2 days w/with typical personal+business use), WiFi /3G/4G are strong , all of my apps & services work quickly & properly, and most importantly, I know where everything is.
Her's is almost the exact opposite.
Keep in mind these 'updates' are not for your benefit. They only benefit Googorola & your carrier by allowing greater control/restrictions/info gathering/marketing opportunities on their end. Study the Google business model and you'll learn more (Its essentially a version of the old Gillette/HP model - Give away the razor/printer & make $$ on the blades/ink.).
I'd try harassing your carrier until they stop harassing you...Seemed to work for me!
Good luck !
She & I looked thru Android - Android 4.2, Jelly Bean and didn't see anything that offsets the risk/reward toward reward.
It's mostly GUI tricks, more/enhanced Google tracking/personal data acquisition apps, and some of the so-called *new* features are things that even my old GB phone does....
Throw in the potential learning curve factor(time = $$) for digging thru all of the inevitable re-arrangements and she'll stick w/ ICS for now...