thank you very much for your reply. I understand, you did not have the psu so the decision could be easier. I already have the psu so for me it is not advantageous. Have you read the article in Hi-Fi advice of April 2017.
http://www.hifi-advice.com/blog/review/digital-reviews/spdif-dac-reviews/jeff-rowland-aeris-dac-psu/
N.B. I read Guido's articles about Jeff Rowland. How can I write to him?