I have not seen the X Rated Version.
I have seen the film a few years ago when I had a greek VHS to the film.
Its quite violent I suppose (but I am immune to alot of it now I think), and grusome.
It was not bad, and I will probably like to see again in a DVD version, but I just can not put my finger on it, but I thought the film was lacking something.
Sometimes it did not seem to have that spaghetti feel to it, but it is a very late entry in the spaghetti cycle though, and Mattei is not the best of director like you say.
The music was below par.