I can second the differences outlined by gadgetfreaky, who today spent a stupid amount of time with me, letting me drive his Redwood-Ohlins suspension upgraded MY around Manhattan Beach area on rough local roads, main thoroughfares and over RR tracks to experience what the Ohlins bring to the party.
You cannot overcome the fundamental limits of a heavy, medium wheelbase vehicle, but the ride qualities are more refined, definitely smoothing both rough / repaired pavement, manhole covers, and RR tracks at low and high speeds. Car is more stable, cornering body roll, nose rise on acceleration, etc reduced, everything is just more posied. It's just more sophisticated chassis management.
Mind you, it's not a dream ride. The tight characteristics of a nimble performance car remain, and again, the wheelbase isn't long so certain dimensions of swales and ruts will be evidenced by expected behavior, but the jumps, bounces and jolts are gone. You may hear the suspension doing it's work, but you will not feel any serious jolts like the stock suspension exhibits too often.
We did not go out on the highway, but we agreed on shared experience with a section of the 405 just south of the I-10 intersection that the stock suspension really fails on.
MY description: it feels like a blowout has occurred. The pavement sets up a perfect harmonic in the chassis.
He says the suspension has cured that. I believe it, given the roads we tested on today.
Also, we ran FSD Beta thru Manhattan Beach - tight roads, cluster intersections, double-parked vehicles, construction signs and roadworks, ALL HANDLED WITH APLOMB.
There are no standard straight roads or intersections in MB. It's a high-density population center on hilly terrain.
There was one 'T' intersection that FSD failed. But FSD gave the car on the RHS stop sign some 15 seconds time to proceed, they didn't and FSD began to enter the intersection - just as the other car tried too. So we had to take over.
FSD appeared to offer the correct priority (RHS driver) time to move. When they didn't it entered the space, just as the opposing driver decided too as well, but FSD didn't back off.
Many thanks for your very generous spending of your time testing with me on setup. Kudos !!