I first saw the Shure SE530 at the 2006 Consumer Electronics Show, when it was dubbed the E500. The '500 shared the current product's three-armature driver technology and in-ear, sound-isolating, sleeve fitting scheme, but that early prototype seemed almost crude in comparison with the SE530.
In New York and other major cities, I understand, bus accidents are a real problem. Buses turn right and failing to yield to pedestrians. Clueless pedestrians walk in front of buses. I haven't seen any statistics, but I'm guessing that in this era of cell phones and iPods, the problem has gotten worse: not only do such devices distract you, they make it harder to hear warning signs—such as the sound of a municipal bus bearing down on your ass.
All of a sudden, it seems there's a renaissance in in-ear monitors. Used to be there was just Etymotic, but now Etymotic, Shure, and Ultimate Ears are all producing high-performance in-ear headphones. It's almost enough to make me suspect we audiophiles have become a marketing juggernaut.