No, I took one from a local small firm, I didn't arrange it so I didn't do much research on it. I think the stuff we covered was so basic that anyone in sales would go facepalm on how basic it was, and yet for us (room full of engineers) it was so outside of what anyone of us knew, that it was one new insight after the other. Also, it did a lot of role playing exercises, which I find awkward but useful. I don't think it matter much which course somebody at my level (0 sales skills) would take. It's similar to any high school teacher being able to explain a linear function - you don't need a maths PhD for that.