I've recently picked up a pair of these for giggles based on a few folks telling me to check them out, I couldn't review them any better than anyone else here but basically anemic bass and harsh in the 13k region, just like everyone else has said. I prefer a neutral sound so the bass is fine, I did have to calm them down with EQ on the harshness though, all in all, I'm not mad for $23 honestly. I don't exactly have a pile of expensive headphones, but I do have Panasonic HJE900's and AKG 545's for some comparison (and then a pile of lesser stuff). I do appreciate the EQ suggestions peppered through this thread as well as the confirmation on what my ears were saying, good stuff.
Anyway, I do have a question. I see folks saying the metal back plate loosens, rattles, or just entirely comes off. I have not had this issue, but, does anyone know if this plate plays any functional part in the audio reproduction? I think I would be tempted to just leave them off entirely unless they are part of the overall functional design, not including aesthetics.