Hi Farkas,
I love the Sinfonion. If you are interested I can recommend to download the manual from ACL's website. The manual is easy to read and here and there a bit humour has been added, so it's not "dry-stuff" you are reading, I feel it's one of the better manuals out there under the Eurorack modules.
Then the Sinfonion itself, well most I told you already in my above post. Though it's a fantastic module, one has to keep in mind that it is a serious black hole that sucks up any module that's nearby located. You are really going to need almost every module you have in your setup (at least in my case) because you need tons of modules to keep all those channels "happy". 3 voices, chords (4 voices/oscillators would be nice, with 3 it can be done too) and an arpeggio, so preferable you need at least 8 oscillators then plenty of LFOs, EGs, large mixer or several mixers, VCAs, filters modules, etcetera (well you know the drill) to keep the entire thing going and working the way you like it. That's why I call it the black hole of my setup, all modules are being "slurped up" by the Sinfonion ;-)
In the far future, I might even consider a second Sinfonion however that costs yet another fortune, so I am not too sure about that at all.
Kind regards, Garfield.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads