PS Audio P-500 good, bad or indifferent ?

I realize that these type of devices work differently from system to system, house to house, etc. Has anyone had any negative expereinces with the P-500 ? Do you think it is it worth the 2K price ? I have listened to the Audioprism Foundation III on my system and like it. I have never heard any of the PS Audio regenerating devices. Any comments or suggestions ?