I grabbed these during the Woot sale just for kicks. They're actually pretty impressive at $17, and if anybody wants a budget set of canalphones with strong bass and decent mids, you'll probably be pretty satisfied.
However, these do seem to be extremely picky about proper fit and insertion. The first thing I did was pull the medium tips off and switch to the larges. I stuck 'em in my ears, and...
scaffolding.
Ugh. No bass. Whatsoever.
I knew that this had to be an insertion problem, so I tried and tried and tried again, to no avail. I had just about given up, assuming that my ear canals are just naturally unable to accommodate these phones. In a last ditch effort, I switched to the medium tips...
B A S S! ...and plenty of it.
Whew! I guess I just expected the larger tips to fit better. Lesson learned once again!