They are a light duty tedder that is very reasonable for smaller operators. You can buy them new for around $2K. I have a three point version just like the pull type your looking at. I love it. We do not have to ted the hay every time for beef cattle. Sometimes you get rain coming in sooner or hay that is wet. The little three point tedder works great for that.
IF your going to buy it thinking your going to run over hundreds of acres with a rough operator running it you will soon junk it.
They have there place for the smaller hay producer.