We started using Zeffy several years ago to replace our POS system that was cumbersome and expensive. We use it for on-site and mobile merchandise sales, on-site donations and ticket sales as well as for email event and fundraising campaigns.
The ease of use makes donors and purchasers feel confidant about their transactions, and we like the reporting and follow-up tools that are available. We don't use all of Zeffy's features yet, but are glad they are there when and if we need them! We have encouraged other non-profits to try Zerffy.