Hi mrlen and welcome to siduction.
The basic crew of siduction has been following the path of Debian Unstable since the historic days of Knoppix and Kanotix. It used to be a really rough ride in the early days. Nowadays, things are a lot smoother.
As to why you should use it? If you like Debian and prefer to use current software, there is your answer. Debian does and probably will never release Unstable. So, we provide users who like to run Debian Unstable, also known as Sid, with an image to start off with and support here and on IRC (saw you there, missed you by 30 minutes, as we are mostly in DE).
We love FOSS, but we also want to help people install siduction on current hardware and get their wifi up and running, which is not always easy with Debian Stable sticking to main in their repositories. Hence, we offer unfree firmware - take it or leave it. The choice is yours. More on that can be found in the release notes.
Free speech - of course, as long as it does not hate speech and similar statements. Other than that, we are pretty laid-back folks.
Let me close this with some hints as to how to keep your install happy: Do dist-upgrades regularly. You can do them up to 3 times per day, but once or twice a week will suffice. Before you do, a short glimpse at the Upgrade Warnings (DE / EN) section here on the forum is advised. Other than that, if you are not comfortable with apt and the Debian package system, you should get a grip on that.
And now have fun computing with siduction.