Well, with penguinbait's and Benson's assistance, I finally took the plunge and updated my dual-boot (flash/internal mmc) n810. The steps that worked for me are here. Haven't noticed any substantive changes yet, though I haven't done a lot of testing. I'm just glad that my "should I update/shouldn't I update" internal struggle has been resolved.

Though, OT, I sped up the speed of the browser a LOT a few days ago by uninstalling adblock and installing flashblock.