The user, a product designer, found the website's interface clean and calming due to the color scheme. They found the PDF compression process simple and fast and appreciated that it was free and didn't require a login. They didn't feel like anything was missing.
The user, a CTO and co-founder, found the UI simple and the purpose of the app clearly described. They found the "low-carb" metaphor odd but memorable. The compression worked well with significant reduction in file size, but with expected loss of image quality. Overall, they found the tool quite useful as is.
The user, a startup founder, found the app easy to use but was disappointed with the compression result, as the file size increased instead of decreasing. They wouldn't change anything else about the app besides fixing the compression issue.