PAL user here, I first burned the the DVD5 with Verbatim DVD+R, I did the 15% trick and everything worked fine.
Then I tried the DVD9 version, I first burned with Traxdata DVD+R DL (Brickblocked ISO!) and I got alot of disc errors and stuff.
Then I tried on a 8x Verbatim DVD+R DL and burned at 2,4x speed in IMGburn, everything seemed to work fine, no updates (Since I did the 15% trick on the DVD5 version) but then I found a problem! Mario's DOWN B attack and Squirtles B attack made the game freeze! But I changed from 50hz mode to 60hz mode and now everything is fine!
Been playing for over 10 hours, finished SSE, have all characters, played alot of online matches and not a single error yet!
So works fine here!
Wii 3.1E with Wiikey 1.9g Beta here btw
BEST GAME ON THE WII YET!
10/10!