Audio cord 'Y's from the module to each headphone ear cup making it more difficult to put the headphones on and take them off, as well as uncomfortable when working while wearing them. Consumer can use shorter or longer cords. Evergreen standard included cord is 12 feet. Audio cord from module to audio device is moulded to the module and is 10 feet in length. This provides for an inherent warranty issue as the consumer has to return the headphones should the audio cord be at fault.
Consumer is limited in length of cord and service of such.
The ergonomically designed fit provides for more comfort. Designed with ear cups mounted centrally with respect to headband. Older electronics required larger parts thereby requiring larger module housing. Reliability issues due to interface with headphone speakers. Circuit didn't protect against overdriving of the input.