If you need to cut 5/16" fiber cement, this is the tool for you. It's not "dust free" but it is much better than cutting with a spinning blade. Cut edges are very clean.This is made very similarly to my old Porter Cable shears that I wore out. I saw some negative reviews about bad cuts. I suspect that it is mostly bad technique. As long as you keep the bottom of the stationary blade firmly in contact with and parallel to the siding, it cuts cleanly and accurately. If you try to lift the back of the tool, like to turn corners or for any other reason, it will shred and delaminate the siding at the cut and make a real mess. That's from someone having made literally thousands of cuts with this type of shear.Upon a recommendation by a DIY friend, my husband ordered this tool and it made his job of cutting hardy broad siding so much easier and safe. He highly recommends it to anyone.I just finished siding about 2500 sq ft of siding and wanted to write a review after I was finished so I could give an honest review. I used both the shears and saw blade designed for the Hardy fiber cement lap siding. The shears were easy to use and didn't produce as much dust which seems to be one of the big selling points. I liked not having to put mask and glasses on everytime I used the shears. You have to get used to where it cuts, there were a couple times at the start where I had to either re-cut or get a new board out simply because I wasn't used to where the cut would be and was off by maybe a 1/4 inch or so, really no big deal. There were a couple times it seemed like it jammed but would start cutting again after a moment. The cuts it made were rougher than the saw though. When we wanted a smooth end cut we would use the saw blade because it produced a nicer, smoother cut. Most of the time it didn't matter because we were caulking over those cuts but there were a couple times we had to make a cut that wouldn't be caulked over so the saw blade was nice to have. If we had to rip a board we would use the saw blade most of the time because it would be a little faster but it did really kick out the dust. We also had to use the saw blade for the trim as the shears won't go through anything that thick. I would definitely recommend the shears as they were easy to use and most of the time very quick. They didn't produce the dust and held up nicely on the 2500 sq ft of siding we put up. I did like having the saw blade though as well. We only purchased one saw blade which lasted the whole project.ExcellentI was worried that the 4.5 amp motor was not going. To be enoughbut it turns out that it actually has a 6.5 amp motor. This thing cuts right through the concrete fiber board like nothing. After a few cuts I had the hang of it. The best part is no dust.Update to this review. I have cut alot of cement board siding with it now and it is still working awesome. I will never cut another piece with a blade. No dust at all with this. It's even easy to cut an extra 1/8 if you cut it to long. I highly recommend these cutters.After struggling with overpriced blades that kept binding up, I ordered this tool. I found it to be super easy to use. Other reviewers mention some binding or chattering. I had that too, then noticed the cord had sunk into my cut and was skewing the tension. No cord in the cut, no problem. Another person complained he couldn't see his cut line. If you guide the the cut curl back towards the tool, you can see fine. Another plus is that you can stop in the middle of the cut, then continue whenever you are ready. Did I mention the lack of dust? Not being covered in clouds of silica dust was amazing. Even though this tool is a one-trick pony, it was well worth the price for what it saved me in time, stress, and effort. I highly recommend this tool for making long cuts on 8x4 panels.This tool is a must for any contractor.There is not dust extremely accurate and fast. I’ll never use my chop saw again. Great tool.