Are you talking about an air powered hog ring tool? That $700 price tag is only one reason why I don't have one. You will find very limited usage for one because they don't go into tight places very well. They were designed to be used around the border wires of box springs, and don't lend themselves to many other applications.
How do I know this? From working in a Simmons factory that also produced mattresses.
No one lives forever, the trick is creating something that will.