Seems like a major scam to me. I buy silicone gaskets, 12 to the box, that fit snugly at the base of my cock and balls. If any problems arise (!) like the potential of damaging vascular tissue because I'm pushing the limits of what my cock can safely put up with -- the smooth round gasket is easily stretch out with my hands or -- in case of immediate relief -- easily snipped with a small pair of scissors.
Then again, I'm not into fetish piercings, pain, or pumping. The idea of using a penis pump that just causes blistering edema around my favorite play toy sort of creeps me out.
To each his own. The silicone gaskets only cost U$S6 for 12. They come in black and opaque white and are smooth without any hard ridges. I buy them at car parts stores.