I have the Drivekey and updated my NTSC Wii to 4.2U.
So far I have not noticed any problems with any of my games, but have not tested all of them. I've heard rumors that some folks are not getting their import games working after the update.
Anyone noticing any issues?
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UPDATE
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I have now tested all of my games and found that I have 17 casualties, most of which were working just fine before the update. Since I did not label most of them as NTSC or PAL, I'm not sure which were due to region or if there is another issue (ie: scrubbed discs).
Strangely, there is one game, My Horse Club Appaloosas that is in German & Spanish (also PAL I'm quite sure) that works just fine. Hmm?
Beatles Rock Band PAL used to work, but does not now. NTSC version works fine.