I recently purchased a pair of Sennheiser HD-600's from Jim (James? Just J?)
It was shipped quickly and arrived within a couple days, well-packed to avoid any damage.
There was a minor issue on my end, but he was very understanding and it has since been resolved.
Communication was very easy, and I was kept informed of each step of the process.
I am happy with the purchase, and would not hesitate to purchase from him again.
Thanks!