Both I and my husband make it a point to know as much about a product as we can, before we go into a store. My husband will toy with the sales people and make their lives miserable if they're not at least honest. I will a trust a sales person more if they can say "I don't know" rather than making something up.

That said, I took some of what my TCH salesperson said to heart, and have since found out I was lied to. I suppose that's expected.