Andy,
If you want some Hyperpro Springs - you can have mine for nothing
They've done approx 500 miles - I hated them !
They were ok on the road but when I did a trackday at Brands with them they were completely useless.
Since they are progressively wound, the amount of travel is dependant upon the applied load. Therefore, dependant upon the entry speed to a corner, and braking force, the forks will compress a different amount. Hence it was tricky to predict how they would behave at different corners due to the non-linear response.