More 845 tubes

Wow, 845 based amps must really be selling. Just after the arrival of the new Shuguang Black Treasure-Z 845, there’s yet another premier tube available. Anyone willing to try these out:
Prototype for $899 - how about you? 
price is way high, especially since they want us to  risk our expensive amplifiers as test mules .....
Probably not me, facten. At least not yet. I’ve just put in an order for the new 845-Z, so I want to see how that works out first.
Forget the Z-845 and wait for the ZZTop-845 tube in which I am told will really rock.  Maybe we should get those early adopter Elrog tube users to try out the Z-845??

Has anyone now had a chance to sum up the 845Z Tubes?