Purchased a new RMCE after my 3rd pair suffered the same fate as its predecessors – cable broken internally just at the end of the strain relief on the connector side, so no more audio on left ear, after about a year of use. A 90° connector and/or more proper strain relief would be nice here (the current one is basically just cosmetic rather than actually functional).
When the new RMCE arrived, I connected it to my IEMs but the "click"-sound when connecting it was strange. On closer inspection, the metal contacts in the receptacle on my headphones for the centre pin had snapped off. So my headphones are mangled irreparably. Turns out that the RMCE arrived with completely bent central pins on both sides. Thomann support says this damage self-inflicted though. Do not buy.