Sometimes I'll see something interesting in their catalog, write it down, then, after I land, research and buy it later for a fraction of the price.
Buy directly from them? No way. I'm amazed they've stayed in business as long as they have. I imagine they've survived off first class spouses with money to spend and no concept of planning ahead. But even the most short sighted customers with money to burn are going to disappear as Wi-Fi becomes available in flight.