I use Everdo on Fedora, and the switch to AppImage has been somewhat painful.
The main issue is that there is no integration with the Gnome desktop. For example, I can no longer add an Everdo icon to my dock or launch Everdo via Gnome’s search bar. The only way to launch Everdo is either from the terminal or by navigating to the AppImage file in Nautilus.
I found this post, which helpfully explains how to restore this functionality by installing AppImageLauncher. However, AppImageLauncher is not in Fedora’s repositories, so this creates an external dependency that I need to keep track of and actively manage, which is obviously a hassle.
Also, AppImageLauncher seems to be a third-party solution. The AppImage project’s official solution to this problem was appimaged, but that has been deprecated with no stable solution in its place.
I like the idea of AppImages (this concept works great on macOS), but it just doesn’t seem to be ready for prime time yet. The old RPM version of Everdo was a much more seamless experience.
(Edit: minor tweak for clarity.)