Mine is not a priefert but it is an auto catch and very similar. The cattle catch it with their shoulders as they try to exit and close it onto their necks. I am getting accustom to it and like it more now than I used to.
Here are the negatives to mine:
1) With smaller heifers or steers, I have to set it a little more closed or it will miss. Once you experience it a few times, you get better at judging the gap. Luckily I have the ability to recirculate the cattle back through with the way the pen is set up. So if it doesn't go right, I don't panic. Now that I am used to it, I don't miss.
2) If the cattle are not moving hard into it, it will not latch and they can back out. It is hard to get them to go back into it once they back out and they are in the chute holding up things. I don't use a hot shot but there are times in this scenario I would have. I have learned to get them moving hard into it and to help push the sides closed such that it latches. Plus grease it up really well and keep all foreign items out of the way such as dry droppings that might get kicked into the bottom side.