There is another in ear product, a professional in ear stage monitor. Not cheap, but Shure Brothers has been making a killing supplying the tour circuit with them. If you spot a wedge-free band playing, they just might be using them. http://www.shure.com/ProAudio/Produc...tems/index.htm
While I feel that one of the advantages of headphones is their single driver technology, the dual driver offering is interesting. http://www.shure.com/ProAudio/Produc...o_SCL5_content
Clark in Peoria