Summary: I was not asking for much when I got them; the aspects of construction that probably earned the 'flimsy' comment from another reviewer are likely the fact that the part that actually goes into the ear is on a swivel from the hook: you can push it up or down, and turn it around.
Pros: Does not block outside sounds, can be swung out of the ear without unhooking, does not get tangled with hair or piercings.
Cons: Definitely only worth buying when on sale, not good if you aren't looking for something tht lets you hear outside sounds, not easy to put on (but don't have to be taken off as much).
Summary: Sound quality is OK, but I have had instances where the sound has cut out in the same way it would on an old set of headphones. The sound came back when I jiggled the connection. I am constantly having to push them back into/against my ears because they keep coming loose and slipping off.