Witel:
I'll echo the other posts regarding using the GST on hills. Using the shuttle lever to forward or reverse "clutchless", it is easy to forget that when my 7000 lb L-39 is in neutral, even for a few seconds, gravity quickly takes over, and you start rolling down hill. There is also a 1-2 second delay when shifting between gears, most noticeable when going uphill. This is not the case using the HST, as it provides driveline braking with the HST pedal in the neutral position. But leave the HST in neutral position on the range selector, and it will roll away with the best of them.
It my experience on the farm many years ago, using a manual tractor w/clutch, you always covered the brakes as your left foot pressed down on the clutch pedal.With the GST, the clutch is not used, except for creeping/feathering into a tight spot. The disconnect in my brain seems to be if I don't use my left foot for the clutch, I'm not using my right foot for the brakes to hold the tractor in neutral. My initial hours using the loader uphill resulted in several stalls and reverse freewheels of 1'-10', fortunately without damage to anybody or anything.
My first 10 hours with the L-39 GST had me wondering if I made the right choice. I now have 250+ hours on it, and prefer it over HST, except for loader work on an incline.
WALT