Well FitEar connectors are well known with their unique system and durability, there is nothing to ask more once you read this. If you gonna play with the connectors every day, nothing will stay durable long time.
In fact, generally pretty much everything about FitEar is well known with their durability, hand craftsmanship, attention to detail and similar hard worked achievements. After this point you have to ask only one question to yourself; do I go to Japan to buy one of their ciems or not? That's as simple as that. Making a fuss in here and creating scenes, giving strange examples are kind of pointless.
I was aware of their rebound build quality but just wanted to go a bit more in depth. I didn't know they were less durable than a standard headphone jack and now I know not to persistently fiddle with the connectors, if I hadn't asked I would have never known.
Thanks for your response.
I give up, mate. Why would you compare a headphone jack to IEM connectors? You should be asking about the difference between FitEar's connectors and the 2pin/mmcx connectors from the other manufacturers instead.