One fundamental feature missing.
As the marketing director of my company, I order postcards using several different accounts for our various agents.The site's interface is incredibly easy to use; however, there are a few features I wish it had. The biggest one would be the ability to store mailing lists or being able to select more than one mailing list. Currently, I have to create a new spreadsheet for every postcard we mail, copying and pasting from every list I want to include.