So I just got the PFE122s and I gotta say I expected a little more from these IEMs, with a MSRP of 140$ or so (got em for 80, so I can't complain at this price point)
My initial impressions are that the PFE was pretty fast across the frequency spectrum with nice sparkly highs. On the other hand, vocal detail seemed a bit lacking compared to high end IEMs such as the EX1000 and esp the W4. In addition, I really didn't like the bass of the PFE; the bass just too lean and the decay was too fast to be natural IMO. Finally, imaging seemed very good but soundstage was just okay.
Edited by Fimbulvetr - 6/15/13 at 7:05pm
Overall just a bit disappointed because other IEMs such as the TF10 and X10 cost about the same and had unique qualities that the PFE doesn't have IMO. The TF10 had the mid detail of the PFE and much better bass and soundstaging, while losing in imaging. Not a fan of the X10, but I feel like the X10 can appeal to many with its warm sound sig and fast bass (not as lean as the PFE), whereas I don't feel the same way with the PFE.