Just to extend the metaphor slightly, I've got an ABZ4 (don't like 5s at all, despite owning a couple) and it fixes an issue I hadn't been aware existed much at all, or rather it improved something I'd taken for granted for all my bass-playing life. The multi-scale design benefits string tension across the strings - it plays beautifully, and switching back to my 'traditional' basses, excellent as they are, is a step backward.
It's a good job Sheldon doesn't make many maple-boarded 4s, or else my bass GAS, which my ABZ has killed off almost completely, would be back with a vengeance.
I'd recommend everyone try one, even a 4, even just the once.