I haven't had mine done but I spoke with someone who had. He felt it was worth the money. Be aware that this mod gives you 20/96 NOT 24/96.
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To my understanding the $500 modification allows the Gen Va to accept and decode 24/96 digital signals but it does not upsample standard CD signals to 24/96. The upgrade may sound better but I do not think it is because of upsampling. I also believe that the DACs actually run at 20/96 and not 24/96 as stated in the above post.