If you want to not have the option to jailbreak in the future, go ahead and update.
I've read 6.1.3 crushes battery, probably not worth updating. There's no new features, either.
I've been running 6.1.3 on my iPad4 since release and have not had any issues at all except the Facebook app crashing now and then, but that's been happening even before I got the 6.1.3 update. The battery issues seem to be affecting iPhones rather than iPads, IMO.
Yes definitely, I just updated my iPad with iOS 6.1.3 it's working good.
Well. Not good.
Battery issues and buggyness claims are bogus. I've updated on day 1 every single time for every one of my Apple devices. Never an issue. Ever. Except the issue I have with people with too much free time on their hands who claim these bogus things.
Battery life is worse. It's buggy.