I have owned the PS Directstream MK1 for over four years, and I could and would upgrade if I found there was something much better, but the only one I heard that was much better was over $20K, and that's not gonna happen. So I'd say for $1800 you are getting a great DAC, and as said before, it's not out of date as it's a FPGA, one of the main reasons I brought it.
Hope this helps.