I replaced the house I grew up in with a modular just about 2 years ago. I love it! It was definitely less expensive than a stick built and far better made.
I moved out at the end of January. It took two weeks for the electric company to disconnect the power lines. They delivered my house on Feb 23. It was deleivered in two pieces, front and back. The first section was delivered about 9 am, and by 11 am, I was walking around inside my house. I got the occupancy permit on March 21. When I talked to contractors about a stick built, it was going to be 6-12 months, depending on weather, getting materials, subcontractors, etc. It was also easier to get a construction loan for the modular than it would have been for a stick built.
I had just as many choices as a stick built. I could have any style house in any size. I could select from exisiting floor plans or use my own. I chose one of their plans. It is a ranch that looks very similar to all the other ranches in the neighborhood. I have a full basement. The only way to tell it is a modular is on the inside. The door jambs on the marriage wall are twice as wide as the other door ways, which actually looks very elegant. I could upgrade anything I wanted. I upgraded to hardwood floors in all rooms except the kitchen and bathroom. I also upgraded my windows. They are larger than the standard windows and so easy to clean that I actually like cleaning them! It is so solid that my curtains don't move even on the windiest of days, and my heating bill is a fraction of the old bill. I also had central air installed.
I was also very lucky. I had the most amazing contractors who took me through every step of the process, were always available to answer my questions, and made sure everything was done to my satisfaction. The biggest issue I had was the toilet paper holder was installed wrong. It took them longer to apologize for it than it did to fix it.