Yes it is. I sent it in for the Series II upgrade and it was worth every penny, and quite bluntly I would be very happy if it cost another $1K. The noise floor is dramatically reduced with the resulting increase in musicality. I hear the lack of noise every time I play the system, and hear more music as a result. One can use all the adjectives, added depth, air, etc. and they all apply but I believe that comes about primarily as a result of lowering the noise floor. I did not expect to discover such a large difference. In case anyone is wondering, I do not work for VTL, I have never met anyone from VTL, I am not in the industry in any way nor do I have any economic connection with VTL, directly or indirectly. If I sound like a shill it is only because I am that happy with the upgrade.