I was a kid when these tractors were sold new. I just remember being wowed by 856's and 1066's when dad took me down to the local IH dealer to pick up parts for the M or the silo filling equipment. There were very few of those around in the neighborhood which was in part due to other brands having dealers a touch closer or some guys bought solely on price. I had a relative that was more partial to to 06 and 56 series tractors but that was probably due to the 1960's were his growing days and the 1970's were to payoff what he bought during the 1960's. The guy up the road had an 856 and 1026 but I seldom came in contact with 66 series owners. Just the way it worked out. I remember the IH dealer bringing out a used 1466 to try back in 1976 after dad had just bought the one farm. I really was not impressed as it seemed to struggle with a 5 X 18 plow but then again who knows how well the original owner took care of it.