I have not tried the Growstone products to see if they hold up in a shower....unlike Cermedia MP2C. Some folks in the UK said that both it and Crystal Bio did pretty well. I think I would definitely want a water distribution box over this media and not blast it with a spray bar.
I reloaded my shower with H-1 Chinese ceramic media and restarted the shower since we are having such a warm winter and early spring. I guess it will be months before I can tell if there will be any erosion problems. Kevin Pham said he did not have such problems. But H-1 does cost more than twice the price of Growstone products per volume.