This review is for the 1400 watt model. I had to bust up a section of concrete that was 12\" thick, 18\" high and 32\" wide, then dig through the caleche clay that was underneath. For those not familiar with caleche, it's like digging in asphalt. You hit it with a shovel, and it just chips out a small chunk. The chisel and spike bits that this tool comes with made relatively quick work of the concrete. The goggles that came with the tool are not of very good quality, but would be better than nothing. I used safety glasses that I had for other projects, along with a good set of earmuffs to protect what is left of my hearing. (A lesson that I learned too late in life) The tool is not exactly light weight, but it needs to be heavy to work and hold up. I'm 70 years old, and could handle it fine. It is well worth the price paid, as it would have cost 3-4 times that much to rent a tool for as long as the project took, and I still have the tool for any other projects in the future. The trigger lock button was very helpful in that it allowed me to use it in positions that would have made holding the trigger in the “ON” position uncomfortable and awkward. For the caleche clay, I purchased a 2” wide chisel to fit the demolition hammer. It worked great. If purchasing chisels for this unit you must be sure that you are getting what they refer to as the 5/8\" hex shank style. On that style chisel, the round end section measures 13mm (.5\") in diameter, and the hex portion measures 17mm (.7\"). (See photos) The SDS, BOSCH, and larger hex chisel bits will not fit this model. I could not find a clay spade that would fit this demolition hammer, so I used the 2\" chisel to break up the caleche clay, then a regular shovel to remove the broken-up material. Using a spade, you would probably still want to use a regular shovel to remove the material anyhow as the hammer would be too heavy for shoveling material. Also noted, this model does not use oil in a reservoir with a
M Thornton 
