There is nothing inherently poor quality about modular construction. The assembly in a factory and shipping to the site means these homes usually have fairly high standards of quality and must be strong enough to be transported. The manufacturers are very conscious of codes and quality concerns for the industry. Like picking any builder, the key is to check references. Site work, including foundations and grading and other preparations is critical to the success of the project to be sure a well built modular, is put on a platform that does not cause shifts. You can read an article on this site at http://bobvila.com/BVTV/HomeAgain/Project-1414.html

You are doing the right thing, asking questions and becomming educated on this type of home. There are cost advantages, and with the right manufacturer, very few cons to be concerned about. The hardest part is getting the site work done right and placeing the modular. You will need an experience reputable contractor to do that, same as with a stick-built home.