This article is from the Bagpipe FAQ, by Denise McNickle firstname.lastname@example.org with numerous contributions by others.
As to Ross and Champion reeds, you won't find general agreement on this
question. People who like them say that once they're properly set up they're
quite consistent and require little maintenance. People who don't like them
say that they produce an inferior tone to cane and are too easily affected by
moisture or a changing environment. As of this writing the Shepherd plastic
reeds are very new on the market, so general opinion has yet to be heard.