We have lived in a modular since 2006. I didn't even know it was one til I saw the labels on the windows saying they complied with Federal modular standards. Since we moved here, we have watched two more modulars go up in our neighborhood. The installers seemed to be extremely knowledgeable and worked in an efficient-looking manner.
One of the houses is near the water and is set a full floor above the ground in case of flooding.