I'm a big fan of Hardie lap siding and can't think of another product that comes close to what it does. As mentioned, if installed improperly, moisture can become an issue. It's pretty much bug and fire proof, it holds paint better then anything else out there, but if it's left in standing water for an extended period of time, that will break it down. Areas on the lower part of the wall that get a lot of splash from the rain will mold, and the most common mistake that I get hired to fix is when it's installed along the top of shingles. There needs to be a one inch gap between the bottom of the Hardie from touching anything. Quality paints also makes a difference. When something like Sherwin Williams or Valspar is used, you will never have any issues. I do not recommend any other brand of paint!!!!