The current carousel widgets are not responsive to the size of web pages. I've tried all three carousel widgets but am finding that they tend to break out of the side of the website at anything other than a large desktop screen size. The fixed width is too large and the widgets drop to the mobile size when the containing website is still at a fairly large desktop size. This makes them unsuitable to just drop into an existing website in their current form which is unfortunate because that's the point of them.
With every website now being fully responsive to all screen sizes, I would suggest that the widgets themselves should be fully responsive as well and only drop to the mobile version at an appropriate mobile size.
The way the reviews carousel could be made responsive for desktop and tablet sizes could be something similar to the way slick.js works. Not only are the individual slide containers responsive, the carousel shows a different number of slides depending on what screen size it is being viewed at.
From a developer point of view, the carousel responsive breakpoints are configurable in the code. It would be good if within the Feefo hub, the user could choose to have predefined breakpoints or set their own custom ones based on their own site design.