The first one suffered from an internal broken wire which meant I only had sound in one ear.
The second one's boom mic snapped when I was pulling it closer to my mouth. i think that there was a manufacturing defect as it should not have snapped so cleanly.
I'm still using the grey tips supplied with it - a tip from a "Swedish" chum is to put them inside a sock when dirty and stick them in the washing machine! Does a great job.
Another mate had a set of earpeices made by a high street hearing aid company, he really rates them!
Stik