I smell something fishy here. These things are identical to the Etymotic ER-20 that I have and are priced 3 bucks higher. Is this a legitimate product rebranding or simply some douchebag who bought the Etymotics at a bulk rate and simply turns around and sells them as his own product? Even the carrying case is the same minus the label.
If you are thinking about getting these seriously, save $3 and get them from the company who actually DESIGNED them. They are $12 and you can get them from their site.
My two cents - I only use them when I know a concert is going to be REALLY fucking loud.