Friendly eeeeeeo to you all!

I kept an eye quite often at the forums, few times wanted to ask but then found already the answers.
This time perhaps I've found the answers but probably I don't understand them correctly.

So I have this N900 here in my hands, Version 21.2011.38-1.

I have to admit, I do not work much with the N900, I mostly use it as a backup internet connection to reach my workplace network when I'm working outside.

So up to now I always used the same style, the same apps, and that was it.

I always was interested about what my mopho would feel like if I'd keep it up to date a bit more but always was scared doing heavier loads on it.
Last Year I installed Nitdroid, this time I'd like to try CSSU.

From what I understood, CSSU is somewhat a patch for maemo, integrating more functions, settings and visual effects for the UI usage and otherwise allows updates to older and newer apps.

So yesterday I installed it. CSSU 21.2011.38-1Smaemo6.1 Stable. I was really happy when I rebooted the handy and it was still working .

But I do not see any kind of difference. The only addition is the "About Community SSU" in the Settings window.
I watched videos where they show the portrait mode and so on.
I tried to reboot a few times, and also tried to install it again, but HAM says it's already installed.

Then I asked myself, if I'd have to install CSSU Thumb but while investigating more about CSSU Thumb I came to the point that this was something different again.

So here I am, begging on my knees - wanted to know - what did I do - what shall I do?