I've only had mine for four days, but I've already lost the left side one! I've lost it in my flat, as I had 40 winks in my chair then later found it wasn't in my ear. It was there before my doze, so it has to be close by, thankfully not outside my flat which would make finding it almost impossible. I'll have a root around tomorrow to try and find it as it's too dark now, even with my lights on to find it. This tells me that no way should I buy expensive private ones, as like I predicted, I'd easily lose them! 🙄