I decided on Silvers CO because they manufacture all the components and RRRacing uses Silvers CO.
The change is dramatic. The IS350 handled decent before but after the CO were Installed the handling is near unbelievable. There is no body roll and it responds instantly.
The ride is definitely firmer than stock, in a good way. It doesn't bounce around at all. The adjusters make a noticeable difference when changing the setting.
The quality seems very good.
The customer service is great also and provides prompt and detailed answers to any technical questions.
No buyers remorse. Great product at what I think is a great price.
I've adjusted the ride height several times and it's fast and easy.