Does GUM have a few good shops on the concourse where one can quickly purchase a new bottle of water, a new snack or two and maybe a quick souvenir in between flights? Would they be open around 6 or 7pm on a Saturday for that "hub pulse" of flights? I have a 95 minute connection which is longer than the tight ones mentioned here. And is the wi-fi in the terminal free? (Some websites report GUM has wi-fi).
Thanks!