Pros: The ones they did send me sounded pretty nice. lasted me about a few months. Nice bass
Cons: They sent me some other panasonic headphones that actually are worse and cheaper than these for some reason. Did they get confused? I just noticed because I'm shopping for new headphones after the ones they sent me just died out of no where. I wish they would've sent me these instead >:O
Summary: At the price, with the free shipping I got, the quick delivery, and the cool color scheme, so far this has been a good purchase.
Pros: Looks cool, has a few sliders to keep the cords from being tangled, the jack is made in an L-shape rather than sticking straight out, it comes with a few different sizes of ear bud covers, and the sound quality is decent.
Cons: It doesn't go loud enough. When you're outside or on public trans, you can't hear them. It would be cool if it had it's own volume control or a case to keep them from tangling in my pocket. Then again, I must consider the price, lol.
Summary: The upper range on these doesn't seem very pronounced. However, if you want to preserve your ears, you don't want those frequencies to be too loud in the first place. (I actually have the non K series of these phones)
Pros: Good bass response.
Cons: Bass can be a bit much if you prefer the higher spectrum of sound.