I've never seen one in person. I do have a grapple but the bucket is my most used loader attachment. I'd really like to try one out.
the 4in1 serves as a time and effort saver for me. it also kinda fills the need for a grapple for the few instance where it would be handy. my main use for the 4in1 is dry lot paddock cleaning. it drops the time to clean when combined with the snow pusher dropped my time from 2 hours to about 40minutes.
the standard bucket is clunky and not easy to get all the poop piles and required manual shovel work. meaning was wasting 1.5 hours or so and having to do manual labor leaving less time and desire for other daily tasks.
i clean dry lots once a month with two to clean meaning im saving 3 hours on that day making it a much easier shorter task.
the 4in1 doea work like a grapple as i can pick up things as long as i dont care about damaging it