Yea, im wary of getting customs just because I know my ear canals aren't always a constant. Depending on current health or whatnot they seem to change slightly from week to week.Universal IMO is better. Custom is great when it fits, but over time both technology and ear shapes may change. Buy universal and sell at minimal loss and buy the new flavor of the month is far better to me than rocking outdated custom fit products. Imagine if your only IEM was like a 7 year old custom? How far have we come since then?
I also saw that Comply now offers 'custom strips' to solve fit issues with CIEMs. So I take it perfect fit isn't always the norm with those.