A lot of people bought them for the RSX. And while I never really read any complaints about them, I notice that a ton of people are now selling them.
They offer a lot of different spring rates, which is nice, but several of the vendors that I contacted were confused about what rates they were selling, and didn't know that there was more than one rate available. And, no one could really say what to expect for ride quality, regardless of what rate I went with.
I also like the fact that they're made out of aluminum.
The part I was concerned about was that they don't have a long term history, and they really didn't offer enough of a savings to me over the Tein Flex to risk a new product......