I posted some of this on another thread, but I think it goes here, too. I also find Bergger to be truly lovely. I used the neutral based, VC glossy paper. Developed in glycin or Neutol Plus, it is blue black. In warm tone developer, like Agfa Neutol WA, I think it really glows, neutral with slight warmth, just right to me. It seems highly responsive to different developers, and will likely take on a distinct personality in each. I don't like to tone it, I like it just out of the developer. If you do tone it, expect dramatic changes to occur, possibly ones you will like. It is quite sharp, and fine distinctions in micro contrast are apparent.
My first reaction to this print is not how the tone holds up or how sharp it is, but how lovely it is.
I am curious to try the graded version.