Truly it works great, and was somewhat straight forward, though there was lots of restarting windows.
I personally felt it was suitably low enough to monitor a performance being looped into the interface, through EAPO w/ Dirac and back out to the speakers.
I measured it at less than 10ms using 192 buffer size 48khz sample rate on ASIO drivers using a Focusrite 18i20. Though EAPO says latency is around 1.6 seconds it is MUCH lower than that. So I did manage to get this working with the Dirac VST. The only thing is indeed the great Equalizer APO. so with the upcomming multichannel 5.1 Dirac version this isn't an option also. The "J-river WDM method" doesn't work at all, this route gives superhigh latency and cracks/pops/noises from time to time and the other route "VST hosts" are limited to 2 channel max.
Let's hope that he can do it, it would be amazing to have Dirac's VST working for the whole system and with low latency and multichannel in the future when Dirac releases it. So the waiting is on Jonas Thedering to update EAPO with proper VST support but he hasn't given an update in 10 month's about this subject. Such a pity, because that was the best feature of Dirac for Windows. But this version has been discontinued and a new standalone version is not likely to return I understood from Dirac support. So sad that Dirac dropped their own driver, the previous Windows 10 version of Dirac was perfect because it was "standalone" and not an VST, that version was perfect for system wide room correction. Jonas Thedering is working on better VST support as you can read in this thread:
There is no "real support of VST's" at this moment in Equalizer APO.