I have a set I scored off eBay recently and hope to try out this season. At around $40, I figured I'd give them a try .....
I need to pop the springs off and clean them up, install some rubber bushings in one. Luckily, I have a junk set that came on a parts bike I can scrounge the eye rubbers from. I'm going to try to polish the spring retainers and adjusters. These look very similar to the set that came on my '78. Those were from another aftermarket American company, Pro-Lift, but maybe they're from Monroe as well?
If the springs turn out to be too stiff, I'll go with my old standby, springs from old BMW R bike shocks. The Pro-Lifts were too stiff, so that's what I did with them. I also added the nice alloy BMW spring covers .....