OH has hit the nail on the head there, for arthritic or more senior hands they may well be a boon.
JB is sort of on target with the all day pruning.
But, what starts as an aid to people with problems becomes a prop to the lazy. If I was pruning all day I'd be sore on the second day, have calluses and a stronger hand / arm by the second week.
Those who have seen Wall.E, where the future humans ALL end up hovering around on what started as the stretchers for injured

will know what I mean.