I used the concentrated version of this developer (see the APUG Chemical Recipes Section) in my own darkroom and in a teaching darkroom for years. It is an excellent paper developer - the tone can be adjusted (warmer) by adding additional KBr and adjusted (colder) by adding Benzotriazole instead of KBr. I used it occasionally for developing film with good results as well.
(there was a url link here which no longer exists)
Agree with previous postings - I use it for paper and also sheet film. It keeps well. Agree that it has a neutral tone with paper, Ilford Bromophen (not sure if currently available) gives warmer tones but has to be mixed from powder.
I use it as the basis for a B&W reversal film developer, as described on Ilford's web page. For this purpose it seems to work well, although I think just about any MQ or PQ paper developer could be adapted to the task.