These seem like cheap (quality-wise) headphones slapped on with the JBL logo and marked up with a high MSRP. Looking at the tech specs, I'm not impressed. Frequency response is only 20Hz-20kHz. Even low-end JVC headphones (HA-RX300) have a frequency response of 12Hz-22kHz, and the JVC headphones were on sale at amazon for $7.50 recently and can be purchased regularly around $15. I don't think the JBL headphones come with a 6.3mm plug adapter either.
Hope someone can convince me otherwise that these are a good deal because I am looking for some decent, inexpensive headphones in the $20-$30 range.
as i commented earlier, why not consider the panasonic htf600?
it has lots of positive reviews, on amazon and on head-fi.