In my opinion, one cannot go to a big box store and EXPECT sound advice and knowledgable sales people. Sometimes it happens, but one cannot EXPECT it. COSTCO sells a lot of computers and printers, but no one knows anything about them.
My local HD went way above the call of duty with my saw. Scott, the tool crib man, grabbed a kid and they took off their aprons and drove home with me to help me unload it. It happens, but you can't EXPECT it.
One must support their local specialty store to get useful floor models, use instructions, demos, etc.