When I travel for work I often rely on shopping in the tax-free area of an airport for buying gifts. This has lead to disappointment in the past. Airports like San Francisco, Orlando and Berlin Tegel don't really have a normal shopping area after security, which lead to me arriving home empty handed.
How can you know before going through security if an airport has a decent shopping area after the security checks? Orlando was the biggest disappointment so far, since there was an extensive shopping area before the security. Now I know that when you want to shop in Berlin or San Francisco, you don't want to rely on the airport.