I switched to the yellow spring shock fer three main reasons;
My old blue spring Sachs had done 21000 miles and was, imo, beyond a simple rebuild and set-up, (corrosion everywhere and adjuster rings seized solid).
The yellow spring Sachs has ride-height adjustment, (me being a short arse, I always need more height!

).
And of course, the yellow spring Sachs looks waaaay more 'blingy' than the dull old blue-un; It has a remote resevoir n everything!
Oh, and I got a 3000-miler fer half the money it would have cost me to service the blue-un as well.

Pound to a penny; If ya had two identical Falcos, each with the different Sachs on em, (both set up by 'Sean'), and raced em, I reckon the yellow-shock wearing Falco would win, (unless of course it was a
yellow Falco wearing it... or maybe a Silver Falco wearing the blue shock...

)
Two is the magic number... ;)