I use my Millenium 50f1.4 (as well as a whole slew of other Nikkor 50f1.4's) on my Bessa R2S. Works fine!
I have a prototype of the current version of the Orion copy and use the 50f1.4's on various M's from time to time.
As stated before, lots of people use the Millenium 50 on RD1"s and M8 with no problems.
The Orion style adapters are easy to use and though they lack the "jewel" like construction and machining of the original, they work fine. Some lenses can be fiddly to mount (the 2006 SP 35f1.8 and for some reason, my 85f2 Nikkor). Most other lenses work fine on it.