My Roadster came with AVO's in 2008. I was very happy with them.The rears leaked after a few thousand miles so I renewed all four. I fitted AVOs to my 2012. When I got my 2016 P4, what did surprise me was how good the standard non adjustable Spax were. They were vice free. I replaced them with AVO's which are still fitted and there was only a marginal "improvement" in feel, which basically boils down to being a bit harder.
In the meantime, I had driven from Canterbury to Yorkshire fully loaded, with a rear damper bracket broken, and you could not tell. Much later I drove from Ullapool to Yorkshire fully loaded with one front top mounting disconnected and it was the same. There were no indications of zero damping. Since then I fitted Spax Gaz adjustables to my Roadster, but quite honestly the difference between having a damper or not is hardly detectable.
So I applaud those who innovate and experiment with fancier dampers, but I remain unconvined that changes make much difference. For that reason I haven't done theSSL front or five link rear.
The changes which did make a noticeable difference are Rog's bump assists, changing the six leaves for four on my Roadster, adding Mulfab steering bearings to my Roadster, and adding a Panhard rod, again to my Roadster. All were very worthwhile improvements.
