you might reach out to 213Cobra - I believe he has been using a set for a month. he's well versed in 845 alternatives and amplifiers.
All 845 owners
Has anyone seen, better yet, heard, the new Black Treasure 845-Z from Shuguang?
http://psvanetube.com/wordpress/store/products/treasure-845-z-select-pair/
http://psvanetube.com/wordpress/store/products/treasure-845-z-select-pair/