I just got in my first stump bucket. I have been wanting to try one out for awhile. I played around with it for just a few minutes yesterday mounted on a John Deere 4044m. I think it's around 30" front to back, but I'll have to measure to be sure. Breakout force is really limited that far out in front of the arms.
Anyone have anything good or bad to say about them? Hoping it's a decent poor man's solution to small stump removal. However, I can see it potentially being frustrating to use, at least until you get the hang of it. I'll be offering them for sale as well.