I have not noticed any significant erosion of the outlet holes our shower head but I must admit the spray pattern isn’t that uniform anymore so maybe it is wearing out. Once in a while I need to probe the holes and backwash the head to get rid of debris that lodges in there. I remove the head and after probing with a paper clip hold the head tight to the kitchen faucet and force water the opposite way and flush it out.
I take more of a navy shower so the Ultra Saver type of head is fine for me. In my opinion, these compact type heads such as I have owned do waste water heating dollars if you use it at high water pressures. I am interested in the Jet-Stream but wonder if it’s flow characteristics would also cause the water’s heat to dissipate before touching your body.