I am not fully sure when I got them but I believe it was around 2009 and have only ever used my ER4P with them (after a brief initial stint with the triple flanges). No issues yet, and I remove them after every use for a wash...I have a set that I had made decades ago. Unfortunately, they had a tendency to break the plastic tips of the older model ER-4s. And while they worked great at home, less the same degree of isolation that I get from the triple flange, they looked profoundly dorky when on the street or subway.
I look dorky without them () but if I can enjoy my music on London's deafening Underground without any volume increase, then that is good enough for me. Better that with high quality music than join the sheeple with AirPods to look trendy... Or tbh, pretty much any other IEM!