there is a barn load of difference in the 706 vs 656 - i kind of thot the 656 was ho hum vs the 560 - love the front entry tho vs up/over the back - i like the torque of the 450 4cyl vs the power of the 6cyl, the diesel helped a little but they didnt lug the the big 4cyl - u get one of those 6cyl down around 1200 rpm u better be grabing the pto handle or clutching its going DOWN, the 4cyl would pull out of a 600rpm lug - easier to get power out of the 6cyl tho, my 560 was rolled some coal