I now have five rock drill bits weighing 40 pounds ahead. I live on a lot with a lot of rock and clay in the soil and I've built two houses on it and dug far too many trenches by hand and with these rock drills. The XRH03Z is great for lighter drilling and drilling jobs and is a joy to use when the big hammers I have are overkill. The variable speed is very responsive and I can work the XRH03Z fairly thin and also dig harder when needed. I'm increasingly appreciating that I don't have to work with more weight than the job requires (as I'm "more mature"), and I like being cordless whenever possible.