PN I've been wearing an in ear molded earpiece on the window side ear) since I was a 727 F/O (12 years ago). I wore it on the bus and dc-10. I like it because you can hear the radios better than an on the ear foam headset. I've used the telex 5X5 the whole time.
I had Shirley do my last mold (hard plastic) and I wasn't too pleased. My first mold was done by a "hearing" company out in Bartlett and they used silicone and were fantastic. I'll try and find the companies name and post it.