I tend to not agree on it flipping the tractor. I use one often for rocks and subsoiling and have no problem with the tractor even hinting of raising up. The top link actually has compression on it similar to a moldboard plow. To lift the front end the top arm would need to be in tension, such as when lifting a log with the logging tongs. Then one just has to be careful.
The ripper tooth (or subsoiler tooth) is either in the ground or against a root (if that is what one is trying to sever) and much below the drawbar line of pull. The 3pt arms are doing the pulling and they are below the axle as well.
Not sure what you are thinking of, but doesn't seem like a single tooth ripper. I plan to give that a try to dig some pine stumps, but don't expect it will break the heavy roots, so will probably have to chop through them.
Any thoughts? Hope I am not being rude to your comment but am confused by it, nonetheless. And, you don't have to agree with me either /forums/images/graemlins/grin.gif