I think spax have come back from a few dark years to being really top of their game again. it does take a bit of knowledge to setup adjustable dampers, which is where those who dont really know will say fixed damping is better. It's not, it's just that bit more foolproof. Rest assured though, one size does not fit all, so being able to tailor your damping to suit your car really makes a difference
As an example, I've a customer with a ph1 172 that i fitted bilsteins on nearly 3 years ago. On a fully trimmed road car he loved it and it handled great after i'd set it up. Once he'd decided it was to be a stripped track car he HATED the way it handled, and there was no adjustment to be done as they're all fixed damping.
What you get is 28 point damping, which allows you to tailor the ride for what you're going to use the car for. With the 182 kits we've helped redevelop recently, I've had the ride described as better than standard by people who's opinions I really respect
I wont supply H&R or bilstein currently as every car that comes in with them fitted has them knocking, and most are low miles and under 2 years old