I will have to say that Oliver made some of the best plows out there.  I am mostly a Deere guy, but I have to say that I will only use an Oliver plow.  I will agree that you can pull them (almost) one gear higher than a Deere plow.  They also do a much better job at covering up trash then most.  Because of this I just bought a model 100 plowmaster on rubber with steel tailing wheel and rope trip.  It is a nice looking plow with nice molboards, cover boards, new points and good coulters.  It could use a paint job, but that is down the road when I get some time.
Andy