Just received a pair of Etymotic ER-4XR IEM. Thanks to Mark2410's review https://www.head-fi.org/threads/ety...-response-earphone-review-by-mark2410.825419/ for pointing me to the Comply tips; ordered a set. The Etymotic instructions suggest to change the tips every three months for their 3 lamellae design, more frequently for the others. This sounds rather excessive to me. On my previous pair (B&O IEM) I still have the original tips from several years ago. What do you do?