I had given it a try in past but keeping silence in the room is big deal. Mainly while playing movie or listen music it become useless and we usually need it at that time as we were away from system. I prefer working while music is on.
Secondly it really take time to get use to it when you are not use to talk much in english.

But it is really a nice share & all should give it atleast one try. It might be future of computers along with touch, replacing keyboard & mouse.