I bought DX200 as replacement for my broken GR07. I use it with my Xperia Z1 phone.
It is my first treble-oriented cans. Most of my cans are bass-oriented or as neutral as ATH M50. I found DX200 is a fun earphone for listening the music. I observed a new dimension of music that i have listened so far. It likes listening to a totally different song. As i mostly listening to rock music, It makes me pay more attention to the timbre of drums and cymbals. The speed ability makes me can distinguish clearly each of fast cymbal hits. Even i'm not a drummer myself, but i can imagine how it was played on the drum.
Today i use it on my iPod Touch 2G + FiiO E11. The equalizer of the amp boosts the bass sound, while the treble is still dominating.
I thought that it will be terrible downgrade from my more expensive GR07. In fact, i like its sound than GR07. The downside is the build quality is poor, as what you expect for >$20 cans. The cable is very thin and looks very prone to broke.