Apart from breaking the cable, I am technically still using the oldest pair of IEM I bought. Sure, it is a replacement set that are only about 3 months old, but I originally got them last February, actually listening to them now.
I haven't listened to them much as I only wear them when I am travelling and I haven't had to go anywhere for almost a month now - apart from shopping and I don't listen to music on such a short trip. They have more bass than the Hifiman do, just less top end. Can make songs sound different.
Only listening to them now as storms around and its easier to use my DAP than listen out for a storm with headphones on. Since I had to send the entire package back when they replaced cable, its a new unit mostly still. Probably only listened to them about 5 times since I got them back.
I just make sure they in a safe spot when not in use. Cable can't be replaced so easily next time. Though I can use my other cable if I really need to - other IEM I own is also 2 pin connection. Those IEM work too, I just don't use it as much. New ones probably use same connector just to make it consistent. I was going to buy some now but they can wait. Who knows, by time I look there be 300 new IEM to sort through.