I ended up buying the new Xthern this winter and used it recently for the first time. It is still loud, but less so than the old one. I won't let my buddy set up his tent within 20' of me if he brings his old Xtherm or neoair, as I like to sleep vs hearing someone crush a chip bag all night long.
Jury is still out on this pad after one night, it's not quiet by any means, but it is warm. Will use it a couple more nights to see if it makes the cut or gets put on here for something that doesn't wake me up like a rummaging bear through camp whenever I roll over.