I was exposed to them when these were still readily available.
I never tried to use them as a playing tip,as mentioned they were super-ball type shit,felt crazy but could apply spin that was phenomenal,but uncontollable too. I did however use them for breaking and jumping.
I've had the same one (black) on the Schon shaft I use with my McDaniel jump cue butt for over 15 years. I don't believe anything is better,period.
I used them on my break cue for years before "making" my own break tips,the Madman and Samsaras have come out since,and BOTH are harder,believe it or not. The bottom line on these is the same,awesome. If I had more than one black one left,I'd have them on ALL of my break shafts.
Even though this was a plastic,it wasn't even close to being as hard as phenolics. Of those,the Samsara is in my opinion the closest to hardness. It wasn't so hard it wouldn't flatten out on cue ball impact,it actually had a slight amount of "give" to it. A well hit break left you with a chalk mark on the ball the full width of your tip,and and least with me,it also left the cue ball stuck in the middle of the table like it died of a brain hemmorage :grin-square:.
The only drawback to these was getting them to stay on due to their texture and what I now consider to be inferior CA glues readily available at the time.
The ones I got to stick were sanded on like 60 grit brown sanding belt-type paper,and a gluing method similar to what is now known colloquially as the Searing method where you more or less apply glue twice.
You sanded the tip,applied CA glue,spread it out without letting it set,blew on the tip to try and get it to set,then added another dab of glue,clamp and let it set a couple hours,although CA quality and technology have advanced a LOT since the early 90's,so maybe that's not the best way now.
If I knew I had a backup in case it failed after cutting to size,I'd try the one I have with Gorilla or epoxy these days and clamp it.
The friend that gave me my last few is no longer with us,but told me back then he was close friends with Bill Howard,the guy that marketed these.
They cut nice in a lathe,and can even be easily cut to size using a Porper Grazer pencil-eraser type cutter. They feel like hard rubber when using a file to shape them,and smell like melting electrical tape when being worked.
I have 2 blue and a green if anyone is interested,but won't part with the black. Tommy D.