They do sound "like" $100 phones. But IMO they are not truly comparable to those headphones. You will notice slightly less clean bass/lower mids, slightly weak lower treble, and somewhat strong treble (which you already did). Note I used the word "slightly." They are kind of moderately well balanced. I can confidently say that they are comparable to any good, major-brand headphones retailing at $50 - $80 (e.g., AKG K518LE, Creative Aurvana Live, Senheiser HD 429, etc), basically telling that they can compete with things costing double their price.
By the way, if you can play with a good EQ software like Electi-Q or Rockbox built-in EQ, you will be able to obtain better tonal balance by slightly increasing the upper mids / lower treble (from 1.5 to 5 kHz) by 3 to 5 dB and lowering the treble from 8 to 12 kHz by 2 to 4 dB.
EDIT: Here is the EQ setting I use:
Center Freq: 3000 Hz
Gain: 4 dB
Bandwidth (BW): 2.5
Center Freq: 9500 Hz
Gain: -2.5 dB
Bandwidth (BW): 1.0
You will hear much better tonal balance. If you feel the treble still a bit too much (it sounds fine to me), you may adjust the gain of Filter 2 (e.g., -3 to -5 dB).
Edited by Jay_WJ - 11/8/13 at 5:01pm