I have had a Racewell (TePari) sheep handler for about eight years. They are one of the earliest ones made in N.Z. . I believe many of the new ones entering the market are very similiar, but most likely made in China. Some of these suffer from fatigue and electronic issues.
To the chase, I am very happy with my handler, having put through thousands of sheep over the years. I have only had a couple of minor issues, which were quickly resolved by Te Pari's good back up. Great as a handler, or weigh and draft machine. Lambs can be cleaned up easily as the are weighed. The tilt allows for a reasonable crutching position. Multiple operations can be done at once, and there is a drench gun and software that delivers the correct dosage of aminal being weighed.
It is easy to draft up to around 500 -600 an hour. A good lead up race or S Bend helps, especially with a single operater. I find that lambs do not hesitate at all, after being through the machine multiple times. My agent, says it is much faster at weighing and drafting than a dedicated weigher/drafter.
Good luck hunting for one. They will help considerably, especially with crossbreed sheep.