Received mine today, and I like them so far.
Here is my initial impression with the grey (white) filters. I really like the mid & high. The kind of detailed mid I was looking for with dynamic yet no-harsh high!! I'm coming from HD600 which has very smooth yet dynamic sounds as many of you already know, and I was looking for something more detailed (not that HD600 lacks details).. guess right word is that I was looking for something more sharp. Should I say I was looking for a finer resolution? And, I think I have it with PFEs. Honestly, I'm not a big IEM fan that my experience with IEMs is limited. Few I had were JBL, Mylarone and some Sony ones. Of course, I like PFEs way more than other IEMs I've had. Already I like them even more than my HD280. In a way, I like it even more than my HFI-780 in certain areas. Only area I desire more at this moment is the bass. There is more bass with the black filter, however I like overall sounds with white filters. Well.. still too early to say I too much about PFE, but I'm liking what I'm hearing so far. Thanks Martin for your detailed review which brought me to it!
By the way, I think I may already have damaged one set of filters. I think I screwed it little too much - perhaps this is the reason I like grey filters better. I will try the other set of black filters later. Whoever buys PFE, be careful when removing the filters. Don't screw the removing tool more than one complete rotation. And I think tips could be better.