We get a constant 2-5 calls per week due to complete data loss and almost all returned external (some internal too) drives share one common thing: the customer installed Norton and/or tried to fix his issues with Norton.
So the first question when a customer calls is: "Did you install Norton?". Too bad we aren't charging anything for our support - Norton Utilities would have made us rich. Now it only costs us money - and not a little amount.

If you love your data or prefer a stable system - stay away. FAR away.