Don't know if I mentioned this before - don't think so. But I actually bent the front lip of my standard bucket slightly while removing this stump. After reading all the comments on stump buckets I decided to go ahead and get one because I figured I could use it more effectively with less strain on equipment than a standard bucket for future similar tasks (why do I always buy stuff after I need it).
I was all set to get the one from Blue Diamond but then got scared that I would do something stupid like tilt the nose all the way down and drive into an earth rock and pop my curl cylinder or bend my loader arms. So I ended up going a little smaller and ordered the Spartan Professional series stump bucket (which I think I've seen under a bunch of different names). I like this one because the bottom of the bucket is the same width all the way back so none of this trying to shove a pyramid into the ground as I've read about on other posts. The sides stay low and have teeth until about half way back the bucket and I think that will really help getting under stuff and ripping roots. (Link at bottom of post)
At ~40" long less chance of doing damage at the expense of ultimately less leverage on whatever I'm trying to move. It does not have a curved bottom but has a feature that works a similar way. The bottom of the bucket stops at a point that will end up being about 12 inches in front of my pivot pins. So I'll be able to push down on that while curling and get a little seesaw action.
Despite being twice as long as my standard bucket, I should be able to get same break out force at the bucket edge when pushing down on this pivot point that is built into the bucket.
I've been doing some simple math and it seams I should be able to put 10,000+ pounds up upward force on a root with any of these stump buckets as long as I can get the bucket under it about 20 inches by using the Lift and dump function at the same time. For example, with 3800 pounds lift at pivot pin and a pivot pin ~40 inches from the bucket edge, if the bucket edge is 20 inches past the bottom of the root you can use the stump bucket as a pry bar. Force at the root will be double the lift force at pivot pin + the dump force at 20 inches. My curl force is 3000 and dump force will be more. So 10,000+ pounds of lifting, tearing force in theory. Would be even more with a longer bucket.
Once I get it and use it I'll do tell you how it works in practice rather than just theory.
Skid Steer Stump Bucket | Spartan Equipment