Sorta makes me wonder if I'm doing the right thing replacing my 200,000 mile 1992 Ford Explorer with a new X5 diesel -- my Explorer is still working fine with it's original blower and blower resistor (though I must say it is not unusual for the blower resistors to go bad in almost any vehicle... it's a not uncommon failure on Ford Focuses, and my Toyota had one go bad).

But four resistors in ten years sounds more like a maintenance item than a repair. Maybe BMW needs to add "Replace Final Stage Resistor" to it's 15,000 mile oil change service!