HAHA, "Professional"..."Heavy Duty", sorry, I use the terms interchangably.
Regardless, I do think there is a difference in Air-tool quality between Harbor Frieght and IR.
And though you did not "say" all products made by parent company are equal, you did imply that a similarity exists between the various lines.
But hey, it doesn't matter anyway (we can still give each other a hard time

) It's all for sho' foo!
Jay