Just thought I'd share my thoughts as I've just fitted these onto the stock shocks, prior to fitting bilstein b6's.
Basically I wanted to feel what the difference is like incrementally.
In my opinion, these should have been standard on the 350z. More compliant ride quality, and they seem to respond better to bumps, like they rebound quicker if that makes sense.
I've not pushed them yet as I'll need an alignment, plus I think I need to tighten something up, as I can hear a vague rattle over bumpy surfaces.
Anyway, great addition even just to stock suspension.