I have a hysucst rib with twin 75 fichts, that were the last to be build by OMC , to date they have preformed perfictly and I would highly recommend them. I have put 70 hrs on so far this year and they pur like a kitten. The optimaxs burn more fuel than the fichts. and four strokes need lots of servicing...
The Fichts that gave trouble were the 150/175 engine as far as I know, maybe just stay away from second hand ones of those, if you are concerned.
NOT THE SHARPEST KNIFE IN THE DRAWER