I do like that they give you 15 minutes to complete checkout once you put it in your cart, that's a much better option than people loosing out while trying to complete checkout. However, take also makes it easier for someone to complete multiple orders.
I think their system is having problems with the re-release of those sales not first completed. That would also explain why the available number has basically been unchanged for awhile now.
I actually expect the 0392 to be worse, unless they make more available. I think demand is going to be even higher, I believe a lot of people were turned off by the $500 MSRP on the 0454.
I think part of this is marketing win for ZT as well, people are now overjoyed to get them at full MSRP.
For example, lots of people got the 0777 for way less than the $600 MSRP. Even on the secondary market for quite awhile they were under $500. In fact one just sold for $475 and another is unsold at $625, so you can still buy the 0777 under or just over MSRP if you're patient.