1) well built
2) portable (not necessarily pocketable)
3) have near hi-fi audio quality
4) price point up to 90 £ ( max. 100£)
The treble was harsh and caused fatigue over long periods of time. I actually find them to be very portable although it would've been cool if they folded up. I used them for jogging and gym until the cord got yanked when i was running on the treadmill.
Beyerdynamic DTX-501 vs. AKG K518:
AKG K518: got ample amount of bass, pretty mids and a bit rolled off highs. Nice sub bass.
DTX501P: I got the impression of cleaner sound, better mids, brighter highs, less midbass and little rolled of sub bass. May work better for acoustic/classic music than K518, but still has enough thump for edm music. Despite brighter highs, not fatiguing. Just right.
DTX501P is much more comfortable.
This is my "first impressions" when I heard both of them side by side.
Thanks Headzone, My music taste mostly focuses on acoustic pop (Tears for fears) and edm with soul touch (Everything but the girl) and some rock. (REM-U2) I rarely listen classic music on the go. I believe that beyerdynamic DTX-501p wont disappoint in that respect.