http://www.leadingedgeattachments.com/multiripperbucket.htm I've been looking at these for a while and like the concept-rock hammer's really reduce the life of excavators. This bucket looks like there would be significantly less destructive force(s) on the excavator when compared to a hydraulically run hammer. Check it out and post the comments. I've got a small job installing electric conduit that needs either a hammer or this to get the cover depth to pass inspection. I'm thinking this is a good chance to run one and see the results w/o dropping a lot of $$$$.