If you can wait a little I'll be receiving my DUNU Trident in a week or so to compare directly. As for the mid-range on the Beta's it's slightly recessed by the bass, but as a huge mid-lover (I love my Ad900s!) I find these to be very satisfying IEMs. It's very lively and engrossing.
That would be great! Yeah, I can wait. I'm here for my money's worth since I'm still a student. :D
AD900 are some expensive shizzz!! I can't afford that as of now ;) But I'll wait for your DUNU trident comment. :)