Pros: great value for your money, great sound and good comfort.
Cons: long burn in, at least 50 hours in my experience.
Before I had the 680, I used my s500, which I realy liked and considerd them great value for 50$.
But now, the 680 have ruined the s500 for me. They sound way more alive, and much more real than my s500, and comfort is way better.
At 70$, I consider them a better buy then my s500.
Out of the box they sounded very disappointing so I let them burn... after a little over than 50 hours I can only say wow!!!
The diffrance was huge, Suddenly I had a realy nice pair of headphones in my hand.
My first impression about the build of this phones was that it feels a little flimsy, they are just so light... but I think that
won't be a problem after I handled them for a while, and they simply feels great on my head.
The cable is the exact same cable as on my s500, which is a great cable.
In conclusion I must say that this headphones, for me are very good value for my money, i'm not claiming that they can
compete with 150-200 dollars headphones, because I never listened to any.
But I can say for sure that in it's price range and perhaps a little higher, those are one of best headphones that you can buy.
I also have noontec zoro which are considerd very good headphone's for the price, but they sit on my table unused,
by me and also my brother which now use the s500 over the zoro's. i also happend to listen to sony mdr v55, and think the 680 is way better.
I can definetly say that I highly recommand this headphons for any one who's looking for a headphone a little over 50$, you won't be disappointed!