I want to know how good are these suspensions, although they cost quite a much?

thanks

 

https://www.rx7club.com/suspension-wheels-tires-brakes-20/

Go here. This topic has been covered quite often.

 

There's a few people that have them, but many look right over them because they're "too soft", but the fact is that most racers don't use springs as stiff as come with many coilovers. If you're too stiff the ride will be punishing and you wont get as much grip on anything but a glass smooth surface.

I'm going to get some for myself next week, but with 7kg/mm front springs up front to give a better balance for road racing. They're very good shocks, and are very durable, easily lasting 30 000 miles and more.