I bought this a very long time ago, same day as Gong's Flying Teapot. A pretty good day - mostly I got rubbish that I can't listen to today without my toes curling, so two hits on one day is memorable. I still listen to both this and Teapot.
I wish I could now see my face the first time I played the vinyl version of this - it is an unremittingly dark and driving work, all the tracks segue into one long piece sung in a cod operatic manner. And best of all, Christian Vander (the drummer/leader of Magma) wrote the lyrics in a language of his own devising, so the libretto that came with the album just added to the peculiarity of it all (sing "Wi Wi Ess Ess" repeated 22 times indeed). Not a guitar solo in sight. In fact the only solo is (a mercifully short) one by Vander himself on drums. The virtuoso capabilities of the band are not at all obvious on this album, although Vander's drumming bears close attention, there's more going on than you might think at first.
Two thoughts from back then - as well as having snooker's Steve Davis as a fan they were one of John Lydon's favourite bands (according to Mojo). People used to bang on about a supposed Carl Orff connection (it's difficult to imagine now but Orff was actually little known at the time - I do wonder if Magma helped popularise the Carmina Burana, certainly I bought it as a result) - but any similarity is pretty overstated, this isn't electric Orff.
It's utterly unique, nobody that I know of followed Magma down this route, and Vander himself wandered off in other directions - no other Magma album is like this (except for the made up language - of course).
Buy it and whatever you do don't expect to take it seriously. But a non government health warning - after two listens odd bits of it will haunt the rest of your life.
Wi Wi Ess Ess as they say.