I recently ordered flowers and Harry London chocolates (14oz) for my aunt's 90th birthday. After speaking with 1(800) flowers, I was told the local florist did not have Harry London chocolates, but they would switch to Ghirardelli chocolates (16oz). Upon checking with the local florist, I was told the order would be switched with a 7oz Whitman sampler box; in fact, the local florist did not even have Ghirardelli chocolate (1-800 flowers had simply fabricated a lie). The local florist was kind enough to send 2 - 7oz boxes of Whitman chocolates when she understood what had happened (no thanks to 1-800 flowers who really didn't care what was sent).
I utilize services such as 1-800 Flowers to do nice things for people I care about. When an order is changed to provide a product of lesser quality and quantity it reflects on me and diminishes the gift. In my business, if I can't fill an order, I provide an alternative that is equal or better. I also do the necessary research before offering an alternative to my customer (and I certainly don't promise a 16 oz box of Ghirardelli chocolate and then deliver a 7oz box of drugstore candy).
If you are ordering something for someone you care about or a business associate, I would not entrust 1-800 flowers with the order.