I used them on a media pc to split out analog audio to a 2nd zone, and on a new Bose to send analog audio into an amp.  Both instances it wouldn't pass the hdmi signal through to the display/avr.  i tested them both on the bench and they wouldn't work with any sources.  i chalked them up to being DOA.  

I replaced them with a different Atlona Model that is meant to convert NTSC to PAL, but also gives you an analog audio connection.  And that worked fine for me.

[Link: atlona.com]