I'm not ready for the upgrade but fore sure, when I will be, I will update the baseband. I just would like to know if there is a particular reason why nobody speak about that...
And from what I know, yes the baseband is related to the ability to connect to a network. But maybe not only, I read that the baseband of a Samsung has something to do with the GPS.
Anyway, as upgrade from 4.1 is a major upgrade, I think that it's better to upgrade this baseband.