I had two Dinky's and sold them to a friend, so I still get to pick them up on occasion. They are both Schaller trems and they're great - completely beyond reproach. I would guess that the 580's are close to the Schaller, because they were the replacement for that trem.
You'll have to play them to check it out for yourself, but I would wholeheartedly recommend the Jackson
locking trems on the 6 - 700 dollar Dinky and Soloist style guitars.
But, they aren't as good as an edge.