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Hi, Never had the chance to run a 5020, but grew up on the seats of my dad's 4020's on the farm. The synchro transmission is great for most field work. The trick when operating it is to remember shift on the fly in a range, and take the time to come to a stop when switching ranges. Eg. 2nd gear to 5th gear is an easy shift, moving down to 4 and 7 takes a bit of careful work on the clutch if you want to do it while moving. The primary use of the 5020 will probably be in the field hooked on a plow or cultivator, with that in mind, just grab the right gear and go... If you need a bit of power to pull through a soft spot, remember that that model of tractor had a button on the throttle that let you rev it up past the 2200 or 2300 default rev limit...
Just pull the button out, and then pull the throttle down to get a few extra rpm when required. I remember spending the whole day running one of our 4020's with the button out while pulling disk seeder in a wet spring... It pulled like a champ, and smoked a bit heading up each hill.. The synchro transmission was better able to get the engine power to the ground, the power shift while nice for loader work tended to soak up a bit of HP in the field work side. We thankfully had one tractor with each tranny, and both were pretty darned reliable. If your looking at getting a 5020, make sure you invest in some good hearing protection, cause those tractors were anything but quiet to operate. I blame my selective hearing problem (according to the wife) on the 4020's.
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