The tool is big and heavy. It chips and breaks concrete much better than a sledge hammer could. I used the tool for 2 solid hours with little break and it worked great until the carbon brushes wore out. The tool will sound scratchy and the power output will be weak when the brushes wear out. It takes about 10-20 minutes to change the brushes and you are back in business. Make sure when you get the tool you purchase some extra carbon brushes (Hitachi part 99044). Don't bother buying extra chisels for this tool. I'm sure the tool will burn out before the chisels wear out. When that happens I will simply reorder another hammer if prices remain this low. The clay spade bit is also a great bit that works as expected.