progressive

Has anyone fitted the Hyperpro progressive springs to their standard Tuono. I have been spoilt in the past and managed to own the Ohlin's clad Tuono's, I am looking at a low mileage late registered Tuono, Standard Showa front and the Sachs rear, it is a long time since I rode the standard...

Anyone used a Progressive Rear Shock Spring ?, are they any good http://www.ebay.co.uk/itm/180942540482?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2648 was thinking of putting it on my new to me sachs shock