there is nothing unpleasant about these after shocks at all.  Like I said, 
they're very clear and crisp and great for speech audio like your phone, or 
whatever random talking device all of us seem to carry about with us these 
days.
However, they do sound rather different than a dynamic driver in a set of 
headphones up against your ears.  First to be noticed is the lacking low end 
response that a moving speaker cone gives to the human ear.  If you press 
the aftershock pieces against the bones of your face, you can get all that 
and more bass back, and it's actually stronger than with head 
phones...however, pressing that hard will be uncomfortable after a couple 
minutes.
They do have a tension adjustment, but it's not like it can be made to press 
hard into the side of your face or anything.  They more or less sit on the 
surface of your skin.  And yep, if you have a little bit extra flesh around 
your cheek bones they won't work as well as if your skinny as a post lol.
The high end response is good up to probably 5K and then rolls off unless 
again, you press the things hard into your skin.
When people say they have allot of bass, yes, they do, but most of that is 
vibrations on your skin or flesh of your face, not actual energy transfering 
into the bones.  If someone bangs a sledge hammer on the floor of your car 
in time with your music, then it can appear as though there is allot of bass 
happening, in fact, years ago, there were some car audio gismo's that did 
this very thing...but it's impact, rather than actual frequency energy being 
passed into the ear or the bones around your ears.
When I was researchhing these, almost all the stuff I found about them on 
the internet was promotional marketting stuff.  There was no real world user 
reviews of them to give a person a true understanding of how they sound and 
where they work best
I borrowed a set from a friend and tried them for a few days like I said. 
While I was impressed at what they did, and the novelty of it a little bit, 
I didn't really think they were the best thing since sliced bread.  I didn't 
really think they were as cutting edge a product as the marketting and 
promotional vidios and write ups say.
I guess at the end of the day I liked them well enough for what they work 
best at, but there was a bit of a let down after reading and listening to 
others go on and on about how great and wonderful they were.
The price isn't bad since a good quality set of headphones is over 100 bucks 
anyway.

I couldn't justify buying these over say the headphones I get for 4 bucks at 
a discount electronics retailer.
However, they do free up your ears for listening, they aren't distracting to 
wear or to listen to while doing other things.  They don't look odd because 
lots of people wear various types of headsets now and it's completely 
socially and cosmetically acceptible.
And they get the job done.

Sorry if this comes across negative or like I'm bashing the product, neither 
is the case.  I'm just cautioning those who might be sucked in by the promo 
stuff into thinking these are an alternative to, or upgrade replacement for 
standard dynamic headphones.
If I used things like trekker, or my phone's gps, or used a portible audio 
book reader while travelling allot I would probably have a set of these. 
Also, I would imagine they are very good on plains and in other high noise 
environments.  The audio is sort of a direct path into your ear bones, so 
noise doesn't get in the way or fill up the air between the speaker and your 
ear canal like with normal headphones on a plain or train or bus or 
whatever.

73
Colin, V A6BKX