I had an all PS Audio set up as of last week....BHK 300 monoblocks, BHK Signature Preamp, and Directstream DAC. I purchased the system for my office in October 2017.... unbelievable sounds without the mentioned tube upgrade. I was driving KEF LS50's and the difference from my old rega integrated and parasound dac was night and day (as it should be considering the price difference).
Started feeling the heat associated with the monoblocks in April 2018 and decided it had to go in June. Everything but the monoblocks are gone.... I'm gong to try bel canto black.... All I can say is that I may be purchasing this same setup a few years down the road if I end up with a bigger office or my home setup happens.
I encourage the upgrade wholeheartedly!
Good luck,
Ken