I hope they don't go away, because I've yet to be able to figure out hybrid coverstocks. I've had two balls now with hybrid coverstocks (Roto Grip Silver Streak SE, Roto Grip Epic Saga) and have failed miserably with both. I just acquired a Storm Power Agent and will try working with it. I've tried multiple drillings, surface preps -- it doesn't seem to matter.
Particle pearl balls to me are some of the best equipment out there. Clean enough through the fronts but with a powerful arc shape. It will be a big loss for me if they ever went away.
Jess