I know how they sound and what they do to sounds. Every in-ear solution I had in my ears up to now doesn't even get close in terms of "resolution" (this is not a technical term but it is true, that some monitoring solutions will let you hear more of the recording than others).
Additionally my on-the-road headphones (Sennheiser HD25) last for a decade now. If the cable ever should fail I can get a replacement. If the earpad is through I can get a replacement. The only problem recently is, that phone manufacturers decided they need to be stingy about adding a 3.5mm TRRS-jack.