I never tried it because once I got my chemistry set together and had 3 months worth of the drug, the US source dried up so I didn't want to start and then have to stop.
Lots of folks, but not all, on the various hair loss sites have had results with it. Maitenance more than anything and regrowth in many cases.
The main sources are chinese sources such as kouting chemical, and Ontario Chemicals, which is in Canada but is just a reseller of the Chinese supply. The people who have gotten results have been using the Chinese stuff and someone even had it tested and it showed up as pure, it's just very involved as you have to wire them the money and it has to go through customs.
If you go to the experimental treatment section at hairlosshelp.com/forums there is a lot more info. The main RU guy there goes by El Duterino.
There is a site with many of these treatments but it's based in Costa Rica and I have heard absolutely no feedback on its legitmacy.
www.mpbtreatments.com
So I'd wait before buying from them, but it is another option.