The composite necks give Zon's a really trebly sound. Needless to say, it'll cut through a wall of distorted guitars like a hot knife through butter, so no fears about getting drowned out (unless you have a weak amp). Workmanship is great. The only Sonus 5 i've played had Barts (I think they all do). They'll give you a nice warm sound that's good for just about any style. Sustain is all there, thanks to excellent construction. Killer B string. One of the best I've ever played.
All in all, it's a great bass. Try one (or any other Zon) out if you have the opportunity.