When we were shopping, we did go into Home Depot to see what options were available. A guy at a desk handed us a brochure, pointed us toward a binder that was sitting on a table nearby, and went back to whatever he was doing before we asked. When we finished reading the (very confusing) literature, we went back to ask a question. He didn't know the answer and gave us an 800 number to call.
That was enough for me. No sale.