It works!
It pretty much got rid of most of the vibrations.
Thing I did different was that recommended 8-10 pounds of tension was putting too much pressure on the belt so I backed it off to 2 and it was much better and still eliminated most of vibration.
There was a little hiccup but Jim took care of it.
I felt the price was little high but I also understand that development of new products cost money and it is a low volume product. Still, to get rid of gut wrenching vibration that felt like it was tearing me apart too, not just the spyder, it was worth it.
Hopefully, it will last a long time.