Timber frame accounts for over 50% of all new housing built in Scotland in recent years, and an even higher percentage in Scandanavia where the idea comes from.
Its being used in more and more commercial property and England is starting to catch on to the advantages - speed of build, cleanliness, accuracy, energy efficiency, etc.
If I was doing mine again, the only real change i'd make is to make the loft space suitable for habitation - sadly, we used the standard prefabricated roof trusses and you couldn't do anything like a loft conversion without stripping the whole top off the house!