JoJo is now available on Steam/Tabletop Simulator
Playtested him and he's fun to play. His abilities work well together and he's versatile.
However, in source, the more down on his luck, the more he seems to pull out. In this version, he's best when he's already ahead. There may be no cure for that, but it's worth mentioning.
He performs high, but I am unsure of 270 high. I think I saw a C3G file on Steam - I may test him against heroes.
Dalinar, when tested against him performed at 310 Points. His power level was oppressive.