Having bred cows in well over 100 sets of corrals and the attached chutes, I can tell you that those old style Teco headstalls are some of the worst things to work cattle in around. I have reached the point that if I walk into a place for the first time and they have a Teco chute, I would rather give up the job than work in that type of situation.
Some people like them, the newer ones are not that bad, but I have never had a good experience around them. I have to trim my son's 4-H steers feet in one, and it is one of the most dreaded jobs around.