Great news, Mike
I think they do need to receive feedback on how this transaction has felt from your point of view but today is perhaps not the day to give them it.
Perhaps take a few days to reflect and allow the excitement of receiving the mirror to fade slightly and then write a factual, objective and balanced review to post in the SGL retailer review area. You can then send them a link to and a copy of that review along with an offer to discuss it with them if they are genuinely interested in improving their customers' experience.
Given the number of similar experiences I have read about here and on their Facebook page I strongly suspect they have little interest in hearing this stuff but I don't think that should stop us telling them.