My 455's were the 55 HP and were underpowered, too low tip speed, "4WD" sucked, etc.
The big thing the 580's have is not being naturally aspirated.
Always wanted one, never could justify it.
"Science is the belief in the ignorance of the experts" – Richard Feynman
I like my guns like Obama likes his voters: Undocumented
Criminals obey gun laws like politicians follow their oaths of office