I have the ER3SE only because I happened upon a lightly used pair for very little. For me, the Harman IEM target is too bass heavy...so I boost that end somewhat less than target...and I find the 2-4 kHz range overly boosted, so I cut that somewhat.
I have had a variety of Etys over the years (ER6i, original ER4, and now the ER3SE) and was never able to get "proper" insertion of Ety triple flange tips. Our daughter is currently a speech & hearing major and says her canals have a sharper than typical bend halfway in. While she refuses to look in my ears



she thinks I have the same issue and agreed it would be impossible for me to get the triple flange tip inserted/sealed.
I will name names on the tip I use: the large Klipsch oval-shaped silicone tip or the knockoff version of same that I found on eBay. For me, it seals as well as the Comply foam tip, is more comfortable, and removal/reinsertion is quite a bit easier. The