Are manufacturer AC cables good enough?

As long as you're willing to settle for, "good enough".............

it's often interesting to see what power cords equipment manufacturers use in their in-house listening rooms...

@millercarbon " Power cords are included as a courtesy, just like patch cords. You aren't meant to actually use them. They are meant to stay wrapped in the plastic bag in the box to be passed along with the owner's manual to the next guy."

Excellent! True. I got quite a laugh at that line.

this thread is a good example of why it would make no sense to include a high quality power cord: everyone wants something different, and wants to choose their own cord, connectors, length, maybe build it themselves, and the non believers are happy with any included cord...