I've only had a few problems here and there, and mostly they're not too bad honestly.  Sometimes a little scary.

That whole 'green pixel' GPU-overheating problem never happened to me, BUT there were times when I'd turn the Wii on or when I'd turn it off, and I'd see a green LINE of pixels horizontal across the screen(and sometimes vertical), but nothing that continued to pop up during.

Also, when I first popped in Brawl(or maybe during that first day, or maybe the second), the 'signal' on the Wii went OUT when it started loading the menu/first-movie.  Basically, my TV displays a blue-screen when there is no signal, and when you turn an external device off, it will display text, something to the effect of 'there is no signal', and that's what it did for a BRIEF second.  But that was all, thankfully.

Had a couple games freeze, some either during or close-to the time they were saving, which scared me.  Didn't do anything though.

And Brawl's amount of loading time makes me worry that the drive is going to wear out before long, but who knows.  It's times like this that I wish it was a top-loading device, although I guess that wouldn't gurantee anything really.  I just know how MUCH more quieter my Gamecube is...

Well, I meant 'quiet' in terms of disc-clicking when the laser's seeking and all that.  Fan-wise, I barely notice it all that much(I think it even shuts off during VC gaming).

OH, that's right!  Shoot, mine's been totally working for so long, I didn't even REMEMBER that.  It used to happen at least once or twice a month....I wonder if one of the updates fixed it?  I mean mine hasn't done that since maybe like....June or August of last year or something.  Man.