I use it for Porters and traditional IPAs. I like it. Treat it the same as table sugar. Use scales rather than volume measurements. While corn sugar and table sugar tend to be fairly consistent with volume measures, different brown sugars seem to have different volumes for the same weight; they have different grain sizes and the molasses absorbs water and it can stick together.
1 oz to 1 gallon will give you about 3 volumes of CO2, which is on the high side for most beers. I like a lot of carbonation and generally go with 5.5 ozs of either brown or table sugar for 6.5 gallons.
Use the same way as priming sugar; dissolve in water, bring to boil and then mix with wort in bottling bucket.