Despite the fact that the WSGFS has all the sharpening options except a green rouge wheel, you can get along quite nicely with nothing but the fine diamond plate and the fine ceramic rod. (In fact, don't use the coarse diamond plate unless you have no edge at all. It's too aggressive for normal sharpening.) I put vicious edges on six knives with it, ranging from soft kitchen-cutlery stainless to a very hard ATS-34 blade from a custom smith, in blade lengths from 2 inches to 8, and found that the device worked unfailingly. If you're really anal about it, or have to perform eye surgery with what you're sharpening, you can use the leather strop, but I don't see a compelling need for it.