Some 3rd-party programs are a bit faster than Gs Richcopy, none of them offer the combination of very tight Windows integration, excellent UI, and useful utilities (such as file verification) that Gs Richcopy does.
It speeds up file transfer between two hard drives, useful to be able to pause the file copy process, very useful error recovery feature, does not abort the entire copy process when finding a copy error and the copy simulator feature is very useful.