They're great. Signing Off, Present Arms and Present Arms In Dub stand up against any reggae recorded in the UK, and beat a fair amount of JA recordings at their own game. They, like Aswad, went a bit poppy in the 80's and made some money, but good luck to them.
As Dub said, they paid royalties to every JA singer who's work they recorded, and many legends (including the incredibly under-rated Ken Boothe) who were still living in poverty now own their own house and can put food on their families table every day just from those royalties. They get, and deserve, huge respect for that.