I don't know that everyone can get a fit that disappears. I had two different impressions and several refits but it seems the closer to a good impression without a refit the better. On my last impression it was from Jerry's main audiologist in LA and the only thing i changed was the length of the stems. The fit is "good enough". They disappears at times but not most of the time. Many people have gone thru numerous refits, some have ended up just selling them others have ended frustrated, settling for as close as they can get. People should be aware that not everyone can get that disappear perfect fit, I sure couldn't and I spent hundreds of dollars on shipping back and forth and two audiologist fees. I have the 13's, took me about four or five months with those costs, i do like them a lot now that it is over but i don't know if knowing what i do now I would do it again, probably not. It is a long and expensive road for many however i am aware that some are lucky enough to get it perfect the first shot. Be happy that you didn't have to end up with "good enough".