2 Weeks now...
Bought it for $179 on Massdrop.
Using Monolith 1060, Senn 580, 6XX, power monitors.
Low Gain is perfectly able to drive them all. No problem at all. 1901-series. (I can't go past -10 db on low gain, too loud.)
Came with v1.04 using driver 4.47.0 under Windows 10.
Best...