Originally Posted by kugino
i hate the hd280s. one of the few headphones that immediately was sent back to the store after the first listen. perhaps i did not give it a chance, but i think they're awful.
This is probably the main reason why some give the HD280 a bad rap. It requires extensive burn in to begin to show its magic, and for me it seemed to improve with use. Plus, from what I've read it improves with better amplification. Headroom.com rates it quite favorably, but then I suspect they burned it in and amped it.
I've used the HD280 and KSC75, very different sounding, form factors, and functions. The problem with trying to "upgrade" her current IEMs is you would have to overcome her personal preferences, which appear to be unknown. There are several things that ultimately could lead her to preferring her current IEMs to either of these arguably better sounding options. In particular is its form factor; she may prefer IEMs to either of these, regardless of any other factors. Personal preference is not about the perception of sound quality by others. A better understanding of her personal preferences would be key to best introducing her to better sound.
However, if needing to buy one of these, I suspect she would prefer the KSC75, light, fun, and perhaps you could put a headband on it for her.