Anything wrong with PS Audio DirectStream DACs?

I hear a lot of good things about Lumin from the T2 on up. There seem to be a lot of people that love the DS updates though. What I can’t figure out is how much better can these DACs get and aren’t the diminishing returns quick after you pass the $5k mark?

I can’t seem to get much info on price other than it’ll likely be a $12-$15k DAC at least. The thing with Directstream that gives me pause is how high the THD has been measured in the past. I don’t know if these firmware updates are able to address the noise floor, but that’s one of the things that make it concerning.

Also, aside from the TSS DAC, there may be a DS 2 that’s a little more in line price wise with the original. 
I’ll say that looking at the amount of deals for DS as it comes to the end of its life cycle is intriguing. Network card installed with Windom for $3-4k.