At least they used to be, I have heard some not so good things about the newer ones. I have a 2 year old Bernina 710 which has never sewn as well as it should. Bernina replaced this new series after 2.5 years., as even they recognized the problems. Adjustments are up to the individual dealer, and mine is not about to lose any money satisfying customers.
In my opinion, Viking, bernina and pfaff are made for the long haul.