A powerful swiss army knife for admin tasks.
And a must have for emergencies.
The image shouldn't require extra work to make it USB bootable.
But nevertheless - it's a project you should have in your toolbox.
The GUI makes it easier for novice users to access and use.
Pro users can stay on CLI level and hack away.
Also consider similar projects like GRML and Finnix.
These are also projects that are still alive and also very powerful and help you sleep at night.
Finnix and GRML (the small version) are CLI only so beware.
SysResCD - a first aid kit you should have in your drawer.
I use it. I like it. I always try to a current version on a usb stick though it can be a bit knarly to install it there. It is handy when one's linux 'daring do' gets away from you and there is a crash and burn situation. Been there.