I'm a little suprised nobody has snagged it yet. Those things used to have bidding wars. The BIN isn't that much more then a 150mm Kiev would cost once you figure in the high shipping from Eastern Europe.
That speed will come with costs other then money. Check out how heavy it is and what filter size it uses. My 150mm Arsat uses 82mm filters and weighs more then some cars. Compare that to the 150mm f/3.5 I have for the Bronica. The Bronica lens is fairly light and uses 62mm filters.
Worse odds are you'll end up shooting at F/4 or smaller no matter what. So the main thing you gain is a brighter focussing but that's the thing you lose with the adapter.