Their records would show EXACTLY what they sent, and they would know it's wrong. No need for Don to pay for return popstage. They sue Don if he doesn't send incorrect burner back. The customer is always right, at least they used to be.
If they're clever enough to get to uni in the first place, they're clever enough to make the right decicions. That's why you had girls talking to you isn'tit?
Or was I not clever enough?
Never had any dramas with my 2 operating stc-1000. I do have one for backup just in case. As a rule i set them 1.5-2c below what I need for consistent results.
Disclaimer - individual results may vary
Cheers, no affiilation etc