I have one just like this one. Used it once, and now have it hanging on my wall as a decoration.
It works well, but you need two people to use it. One to turn the crank, and one to hold it steady. It works well if you are only doing a couple of hundred pounds.
The bad part is that is does not remove the grape stems. Grape stems can make the wine bitter. I ended up going with an electric crusher/destemmer about 15 years ago and have not looked back.