We live in a double wide. It is not new(1971) But over the years it has gone thru several remodels. It now has an insulated metal roof, all paneling inside was removed and it was insulated and is sheetrock and textured. A wood stove ( make sure you follow the codes for a mobile home installation). It basically does not look like a mobile home inside. The outside also was sided. For insurance purposes, we had tie downs installed for wind and earthquakes. We have never had an issue with mice (we sealed everthing we could). We also have never had the pipes freeze. We also have not used electric heat for 15 years. It is cozy, warm and we love living in the woods.
I do think they require as much inspection and maintenance as a stick built home. Keeping it clean and livable is not that hard. It is very affordable, and it's just the two of us.