Panelized Construction

[Tom Bukacek]

Is anyone familiar with Panelized Construction? It is where they construct the walls and shell of the house in a plant somewhere and ship the property. The benefits appear to be fast construction time (lower labor costs) and less waste of materials & theft. I have searched online and haven't really found a downside. Looks like you can construct a house fast and inexpensive. The final product looks good in the pictures. Has anyone seen or built one of these types of homes?