I had VIOOH.
IIf RD, Summitar, VIOOH.
by Kostya Fedot
, on Flickr
It is inferior to FSU copy of Zeiss finder, this is not just my own opinion. Which is also huge, but at least it makes sense financially and functionally.
I have SBOOI, sold M3 after getting it. True 1:1, M3 VF is not.
But prices for SBLOO just as same as for Leica camera itself...