I have owned a T5C for 8 years and recently bought a second on a T5D for my second property 25 miles away.
My terramites can out lift and dig my neighbors
BX23 bota. To use his hoe, you have to get off tractor and climb up hoe to get on a second seat. Terramites you just pull a lever and spin around to use hoe. Don't have to get off seat.
Terramites are not for speed, fast walk at best. If I need to transport dirt or wood chips, I use terramite and load a 10k dump trailer which I pull around with a Farmall C.
One of my properties does have hills and it does stress the unit to climb hills with a full load of dirt.
My T5D has a replacement 20 hp Honda, which is a sweet running engine. The T5C has the original 20 hp cold blooded starting kohler command. I did have to grind the valves on the kohler. Once it warms up it's as strong as the Honda. Both use very little gas, less than a gallon an hour.
However I wouldn't want a standard tranny with clutch on a front loader. You will burn out the clutch or spin the tires before getting the front bucket full of dirt.
I can always count on the gas engine starting when it sub zero. Most other small sub-compacts are diesel.
One down side to a terramite is you have to be able to work on them. Not aware if they have a dealer network. I call the factory for parts and advice. So if you have limited mechanical skills better find one a local dealer sells.
Both my terramites have power steering. They have served me well.