Hello.
I live on the Isle of Wight just off the south coast of England. The buyer would be welcome to collect in person if they wish but I'm guessing that my location is unlikely to be convenient.
I'm afraid I don't know how well the Tomahawk will work with the Yuin PK-1s as I've not tried them. You could try searching the portable amp forum, but I don't know if you'll find the information you want. My experience (with the UM3x and IE8) is that the Tomahawk doesn't change the sound characteristics of your earphone ... it just cleans things up.
I would say that the Tomahawk is in good physical condition but there are light signs of wear which are consistent with a couple of years of careful usage.
If you look at my first photo you'll see that the black coating has slightly worn to reveal the bass metal on the corner edges of the faceplate. The carry case is as new and the rubber feet are unsed. In terms of audio performance the Tomahawk is in full working order.
Edited by TCD1975 - 6/15/10 at 7:55am