Pros: Sound, price, life time warranty, easy to mod
Cons: Design (clip-on system), relatively cheap build material, due to clip-on system comfort issues
They have good old fun sound signature, very engaging and very dynamic. I found mids are a bit too recessed for my tastes and affected by the low region unfortunately however from a cheap can like this, I don't expect the separation of HD800 obviously. Treble is nice, sparkling very detailed and crisp. Bass could be more controlled but it does its job, it has a strong, punchy bass and when the song calls for it, it knows how to give 'boom' effect.
So what do we have here? Very good sounding on ear headphones which can easily compete against 100 euro price range. Is there a problem, you bet! Some people seem to like the design and clip system but I totally hated it. I am currently looking for a chance to make a headband mod otherwise it is too painful for me to wear it longer than 20 minutes. Also I keep on playing with the clip because it doesn't fit correctly and keeps on moving around. Design-wise, unfortunately they are failed in my experience.
At this point, you probably know that they are open back cans, so they don't isolate and they leak sound quite a lot. If you want to hear your surroundings, that's good for you but pay attention, you might disturb people around you.
They are also easy to mod, I saw already Kramer mod and headband mod. If I can do the headband mod (looking for a headband donor cheapo headphone) I will continue with the Kramer mod too.
Also, they might need a little bit more power than your usual average consumer targeted iems/headphones.
I have problems with comfort but I like the sound, I will try to mod them to keep it, otherwise no go for me. I bought these ones to use in gym not as a main headphone and for 15 euros, I think they punch way above their price. However, if I fail modding, probably I am gonna order PX100-II to use at gym.
So if you are looking for can to use in the gym or outside running they are good. Also if your budget is tight, I can still recommend them since they are kind of giant killers. Just be sure that you can handle the clip system or do a headband mod.