I snagged a pair of these on eBay a few weeks ago and I can vouch for them. Sounded terrible right out of the box, but after some burn-in, they sound great. I liken them as Panasonic's version of the Sony MDR-1A, without the bass hump and better treble. You get bass, but it's just "there" and not elevated. Clamping force can be a little tight for people with bigger heads, but with the horizontal and vertical sliders, it's not that hard to find a good fit. The drivers are gorgeous to look at.
Where these cans shine is really the treble and high mids. Female vocals sound fantastic. I think with some modding, they could sound even better. I personally plan to experiment with dampening the space between the plastic cups and the drivers, as I noticed there's a bit of reflection that muddies up the sound. Just beware that the earpad system is similar to V-Moda's where the pads are held in by plastic tabs. I recommend prying a side open with something like a flat-head screwdriver and not pulling by the earpad as you'd risk tearing. All in all a good buy.