Within 15 months of purchase, three-out-of-three hard drives failed on our OptiPlex 5040 MT workstations. We had Pro Support, next day, onsite service for all three. When the last one failed, Dell told us that they were out of stock, and it would be 12 days to get one.
When we asked for a refund of what we paid for Pro Support, as a goodwill gesture, they said they'd have to cancel our Pro Support to give us a refund.