Pre-Fab Homes?

itwerx asks: "I am considering purchasing a pre-fabricated home to put on an empty lot in an urban area. I have researched hither and yon and Googled to my heart's content and found great gobs of information online. The question here is what the SlashDot community's own experience has been with this type of technology? Anybody purchase a pre-fab home recently? What was your experience like?"