Yuin OK2 Earphones

Skoch

New Head-Fier
Pros: Comfortable, Quality Sound, Easy to Drive, Discrete
Cons: Poor Build Quality, Low Isolation, Low Bass Response
Overall I have been satisfied with these phones.  I would not recommend paying full price for them like I did. 

Br777

Headphoneus Supremus
Pros: comfort, durability
Cons: sound , usability as IEM
short and to the point
 
I did not like how these buds sounded or performed
 
they were unable to produce frequencies below approx 100hz and rolled off substantially above about 2000hz
from 100-2000 they were quite flat though
 
i confirmed this using a sine wave and a parametric eq to test the flatness of their sound
 
no amount of eq could fix the bass, since they seemed incapable of producing it
 
mids were pretty good, as were highs if you generously bumped them up with an eq
 
sound stage, mids and highs were all above average (average being cheap ear buds) if properly eq'd, yet the lack of bass made them sound empty
 
amping these did not make a difference
i tried burning in (only about 10 hours) also no difference.  (i am neither a firm believer, nor disbeliever in burn in, i have simply never put any focus on trying it)
 
these buds seem durable, and fit well as buds
 
as iem's using various attachments - un-usable.  couldn't get a fit at all (seems to be a unanimous sentiment from all owners of the OK series)
 
I would not recommend these to anyone unless you don't care about bass at all and can eq them properly.  they are overpriced for what they deliver. 
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