2nd hand
So were mine.
DC 13.4 and they are very good. If I am correct, you get a warranty and such for 3 years? not that I need one ! These have served very well for about 5 years and are still brilliant.
Having said that I would get any pair of headset as long as it's not a mechanical boom (looks too off and always needs tightening!) and has a good feel to it (over the head).
Oh not forgetting a warranty or return policy.
(Hence DC's seem brill)