I thought I liked the boominess too until I got the D600's, then I couldn't really stand how muddy the D5000's sounded in comparison anymore. If the D5000's were able to get the quality bass the D600's have, and tamed the treble a bit, then they'd be super awesome. But the mod doesn't really eliminate the 'boom-boom' factor; it still sounds 'boomy' and leaves enough to rattle your head, it just makes the bass a bit more controlled and less all-over-the-place.
If you like them how they are now though, then it's probably not worth it to mod them; it's really not that drastic of a difference (though definitely an improvement for my tastes).
I'm the same way, except with guitars
Edited by oblique63 - 2/6/13 at 7:49pm