Your comments are the first negative comments I have heard concerning James Hardi Planking.
I have used this starting about 5 years ago as a replacement for that old R-105 pine siding. I removed the siding and installed Hardi Planks, painted them caulked them and have never heard again from the customers.
This does not mean that what you said is NOT true, all I am saying, I have not heard any negative or call back questions. But, other factors like moving away or others could enter into the equation.
I will check into this and see what I hear, but so far until your comments, it has all be very good.
He is out of Mission Viejo, CA and has a super web site, possibly you could entertain these concerns and see what they have to say about it.