How do the bidirectional tractors hold up?

[sqdqo]

Just curious how the TV140's, TV145's hold up? Are they as productive as a geared tractor? Do the hydro transmissions hold up to rigorous work? Looks like top speed is about 18mph for transport. If you are trying to tow or work a load at faster speed will the tractor keep up or does it bog down? Any opinion is appreciated.