Well, I paid full whack for mine and I'm not a reviewer and although it narks me a bit to think that reviewers got to keep theirs, this could be quite common, but I'd also like you to confirm that this is the case - where did you read this?
What I can say is that it's a stunningly good device and makes some of my previous systems seem a bit silly in hindsight. For example, spending £3k on a dedicated R2R DAC which does just that - this device equals it, basically, and does so much more. I loved that DAC but doing direct comparisons at home was a real eye-opener for me. I don't regret a penny spent on it. Which is more than I can say for a lot of more expensive things I have bought......