I have tested all possible options last night with my Wii and haven't got any problems besides the ones i already had!!
I checked all things, shop channel, internet channel, mii channel, games original and backup's, photo channel, downloaded games, downloaded new ones, rebooted Wii, removed from power and started it again this morning added and removed some settings mostly wifi.
What i wanna say is that i tested the complete set of options that the Wii has and i haven't found any problem that could be related to this update!
I think the whole scene freaked out once there was reported only 1 wii bricked after the update and i DON'T think it has anything to do with the update (probably bad soldering or very old chip firmware). second is that nagging screen from big N about possible Wii failure after update.
Like said before, this update DOESN'T harm your Wii in any way!!!
offtopic
I have Wiikey installed and news channel stopped working after the chip was installed, i was hoping that after this update it would work again, it does in some kind of way for 25%.
Version 3.0E is the one i have now in my Wii and in main channel there is scrolling 1 news item but after entering channel i get NEWS000006 error. imo this has also nothing to do with this update, probably didn't work for many of us before the update came out?
A friend of mine has the same problem, news channel isn't working the way it should (also after chip install), same like others here, so if anyone has a fix for that