Traded E5Cs for Beyer 770-80s and cash...despite being a slightly complex 3-way trade with another head-fier, everything went very smoothly. Zack is a fun guy to deal with, cheerful and enthusiastic, and I'd definitely deal with him again.
Just bought a pair of ER-4s off of Zack. The deal went down drug deal style (it's freezing cold out, we met on a street corner, he pulls a small cardboard box out of his bookbag, etc) But I didn't mind looking like a junkie since I saved $5 on shipping.
Just completed a perfect transaction with Thaddy for his iRiver iHP-120 DAP plus some nice extras. Very friendly and prompt communications, fair dealings, fast shipping in a very well packed box, and, best of all, the player is better than described.
I am a happy camper, and recommend Zack highly - an asset to Head-Fi.