Oh my god this thing is great. I built a 24x34 shop with hardie plank siding. This was as easy or easier than using a circular saw. Hardin plank comes in 12 foot sections and I had a few that I needed to cut a lengthwise cut. No problem with this. I did the whole shop and the blades are still sharp. The dust from hardie plank is a known carcinogen. This creates little or no dust. This and two Gecko Gauges is all you need to do hardieplank siding.

This tool is great for trimming Hardie Board! I have used many different tools and ways to cut, trim, etc. while siding my house, and I wish I would have purchased this in the beginning. No dust, crazy vibration. Clean cuts with nice edges and no chips on either side. I took a scrap board and practiced cutting on pencil lines so see if I needed to adjust one side of line or other, etc. took maybe 30 seconds to figure it out, it's that simple. Also, this is one unit. you do not need to buy anything else. this does not hook onto a drill, what you see is what you get, and it performs exactly how it claims to perform. It's great for long trim cuts for windows also. I've completed a 24' wall with two large windows, and front wall with a 10' wide window and normal door, and my double garage side wall, and there is no difference between 1st and last cut. It says you can reverse the blades to prolong before you buy new blades, but I will complete my house before I ever need to change blades.

I was a little skeptical of this thing since it looks very weird and awkward. I decided to buy it because I have become weary of using carbide blades to cut my Hardie Planks in light of the health risks associated with it. Another factor was that holding a spinning blade in my hands wasn't ideal when working from staging.

This tool definitely was worth the money for me. Don't let it's looks fool you. It is very easy to use, and makes very nice cuts in the siding planks. As long as you make your cuts with the planks face down (my siding was prepainted), the edge that it creates is nice and sharp. It only takes seconds to make the cut, and is very quiet compared to a saw.

As a homeowner who doesn't do carpentry professionally, it was very quick and easy to learn how to use. To make a straight cut, the cutting edge will run perfectly along a speed square. I used it to side my entire house (45' x 45', two stories plus 6 dormers), and I didn't notice any degradation in the sharpness of the blades.

The only downside I can even think of is that the while it cuts, it creates waste of about a 1/4 inch strip of the plank. After a while, those little strips make a mess under your feet. Compared to dust flying in the air from the traditional saw blades, I would take this tradeoff any day.

I purchased these shears to cut Hardie backer board for three rooms (19 sheets). I cut mostly 1/4 inch and although it didn't recommend it I did cut some 1/2 inch (.42). The 1/4 inch cut like a hot knife through warm butter only slower. Lines are easy to follow in either direction except for the curl that comes around every eight inches or so. You can travel fast or slow as the trigger is variable speed. The tool is fairly heavy although most all the weight rest on the material while using. As long as you keep the tool resting flat on the cement board and cut fairly straight it cuts very smooth and produces very clean edge with almost no dust. It is only as noisy as a 1/2 drill and very easy on your body. Slam dunk for 1/4 material and although it will cut the 1/2 it is much slower and they do make one for the thicker material. For round holes and lines not straight buy a Bosch jigsaw blade ($10) for cement board and an oscillating jigsaw (harbor freight $30 before 20% off). After cutting 19 sheets of varying thickness cement board the shears show almost no sign of wear and preform as when new. If your body is beat up, older or you just don't like a noisy room full of cement board dust these shears are worth every penny. They made the hardest part of the project so much easier. Highly Recommend these shears!

I have just finished putting up the final pieces of cement board on a master bath remodel. Of all the tools I have bought for this endeavor, this has to be number one, I used mitre saws, jig saws, wallboard saws, utility knives (not even close) and nothing compared to this one tool. Little to no dust, cuts through like butter. You can cut a 5 ft cement board in about 45 seconds. You can flip the blades if they get dull, but I never got to that point with this remodel. This bath is about 11 ft x 17 ft and about 12 ft high. I was hesitant at first spending over $160 on a tool I might only use once, but after having used it, I would pay a lot more. All of my cutting with this tool was done in the bathroom I was working on. As you can see by the picture, the base plate rides along the cement board and the shear is under the board. I built a cutting platform using 2x4s in a hashtag form with the top two pieces on the long axis. Then either placed a large sheet on top to cut alongside one of the top 2x4s or clamped a smaller piece to a 2x4 to hold it in place while I cut along the edge. It worked extremely well. If you are cutting more than a couple of boards this is well worth the price.