I like that it's easy to edit, has many features (including an API), and works with any CMS or framework out there. It also makes creating new codes really quick! There are some minor UI issues in terms of how you can see your work from previous edits etc., but these were fairly quickly resolved by adding more functionality. The developer was very responsive and helpful when we had questions about our code. We used this tool in order to create custom codes without having to use another service such as Google Tag Manager. I like that it works with all devices, from smartphones to computers/tablets! It's not difficult at ALL (even if some of them may look complicated). You can add as many characters or images in your code as you want - this means more space than other codes do have sometimes. The layout options are limited though; we needed something where people could scan our QRCode directly into Google Maps so they were able find us quickly when visiting Paris during Euro 2016 soccer matches!