That stuff is far superior to other siding products except maybe masonry.
I have the shears and they work great for straight cuts. I am still learning how to do the notches or holes for tricky cutouts.
Be careful, the dust it creates from saws is very bad for you. The shears produce no dust, just a curlycue of material as it cuts.
In the past, I used a jig saw. It ate blades pretty fast but the dust was a lot less.
I have been a big booster of the cement board since it came out. We used it when we put an addition on our house ten yeas ago, no regrets still holding the paint well. The contractor we used had the shears. That being said when it came time to put new siding on a small rental house I own we went with Louisiana Pacific's smart siding.
LP Building Products | LP SmartSide Trim & Siding Family. Both the fellows at our local yard recommended it over the Hardi Plank. When asked why the yard manager said twenty years ago the Hardi Plank salesmen would drop a sample into a five gallon bucket of water and a month later you cold pull it out and and it would quickly dry off not having absorbed any water. He said they now use less cement in the mix and it no longer is as resistant to absorbing moisture as it used to be.
I am unsure if this is true but I dd spend a good deal of time going over the issue in some builder forums. I ran across some contractors who said much the same. Of course many made the point as some have here that proper installation no matter what you use is critical to success no matter what you use. My son did the installation. One point he picked up when he also went through the forums looking for tips was the importance of having the proper gap before caulking. He said it is important to have it wide enough that the caulk can work.
By this he means that the caulk will have the ability to contract or expand only a certain percentage of it's width, this will vary depending on the design and quality of the caulk. If the width of the gap is too small, say a 16th of an inch and the caulk has the ability to expand/contract 20% of that 16th of an inch, well you can see that it may easily split apart.
The proper caulk and the proper width of the seams therefore is critical to the success of the project. Also, going with the wider gap means you are using a great deal more caulk then you might if you just went by the seat of you pants and using the proper caulk likely will mean you are spending more money per tube. In short do not underestimate the additional cost of caulk no matter the product you chose.
We choose to use the LP smart siding with a pre-finish, barn red with white trim, Diamond Coat I believe. Our trim also came pre-finished. Another advantage to the smart siding was it was available in longer lengths and was not as brittle.
As of now happy with it, time will tell. I will note that the tip about the width of the seam to be filled is also relevant to caulking a tub or any other seam. I now pay more attention to the gaps I leave when installing tub and showers and how much gap I leave when i bring the flooring up to the tub.