Bergger has been around a long time- they are a small boutique maker of high end products. I have printed on their papers for years, but I use the VC stuff, as they don't make grade 0 or grade 1 papers anymore, and the high contrast stuff only limits the range you can get. But the VC papers, especially when printed with split filtration yield excellent results. The paper itself is very nice, in weight, tone, and pH neutrality. Not many companies are making silver coated paper of this weight and quality anymore. It's expensive stuff, but worth it, especially for the high-end exhibition quality prints.
I have not used their film that much, but the results I have seen can be spectacular. Like their papers, they seem to have a very high silver content, which makes them particularly good for pyro and other staining developers, and capable of quite impressive range of detail. I know a few photographers who swear by them.
Overall, if you have the extra scratch for Bergger materials, you can't really find better.
