Cycle World magazine has a review of JH Audio JH-5Ms in its latest issue (June 2011, pg 100). CW loved the sound quality at low to mid- speeds, but felt that wind noise overpowered the iems at high speeds. They also said that the JH-5M didn't block sound as well as ear plugs. I thought it quite fair from the viewpoint of being used while motorcycling.
Then I noticed that they referenced www.hearingdynamics.net as the source of the JH-5Ms.
It seems that Jerry and Beth Orliss have built a partnership to produce and sell a custom JHA iem for motorcycling and other sporting applications. I don't see many people spending $500 for this application, especially after the review in Cycle World, but it will be interesting to see.