If you have to pound the shaft on and pound it back off $350 will buy a lot of grease, Fluid Film or oil. It will not make any PTO shaft lighter or less cumbersome to work with around a 3 pt hitch. How many thousands of dollars would it take to equip your tractors and implements so they are compatible and interchangeable?
This is a solution to a problem that exists only in the minds of those unwilling or unable to learn the simple tricks to attaching PTO shafts to tractors. Additionally, the use of this product is guaranteed to place the PTO shaft of any trailed implement well outside the ASAE standard dimensions for shaft/drawbar length setup. This will lead to shaft and u-joint wear, excessive vibration while turning and at a minimum require most if not all of your PTO shafts to be cut. This can be problematic for older, domestic sleeve and tube style PTOs and is an inconvenience in any case.
I cannot imagine any circumstances where I would recommend this product. I have seen it promoted on Facebook and many comments there mirror mine here.