About 10 years ago, when I was first getting into SLR photography, I was planning a last-minute road trip, and wanted to pick up a couple of lenses for the trip (a 17-40 and a 70-200/4). One or the other was out of stock at B&H (probably the 17-40, since it was a new model back then), so I called Adorama. It was early in the day, and they claimed to have both lenses in stock. So I placed the order with them, used a credit card with plenty of available credit line, and paid for next-day AM delivery. According to the phone rep, all was well, and I would receive my order the following morning.
The next day, morning came and went, and no delivery. I called Adorama and learned that my order had been processed, but hadn't shipped yet. I was leaving later that day, so I cancelled the order, and did a phone search to find the lenses locally. I had to go to two different stores to buy both lenses, literally on my way out of town.
Since that experience, I have continued to do business with Adorama, but only if I can't find what I want elsewhere, and only if I'm not in a hurry to get what I ordered.