i have bought the tiger helium he4 and he2 (short enough to store in the cab) and really like them. it‘s a delicate tool (not a hammer) but with care should last. i‘ve heard they don‘t like to be constantly wet and stored in the chip-pile.
we removed some larger poplars and alder with alot of backlean (to a house). 2:1 pulled with the 1,8t petrol winch worked fine but i would have liked a proper forestry winch.