The side tones were a big problem in earlier software versions, and to be honest, the DSX is still very sensitive to ambient noise. For most office and home environments this isn't very noticeable, but in a high noise environment, the noise cancellation adapters may be the ticket.

"I'm the one that has to die when it's time for me to die, so let me live my life, the way I want to."
-- Jimi Hendrix