I can't speak to the microfiber cloths specifically, but often the Canon/Nikon-branded small accessories like this really are nothing special. For example, I had some Canon lens cleaning fluid and it was pretty much crap. Stuff like this isn't actually made by them anyway - it's 3rd parties that license the brands.
I've not had great experience with microfiber cloths. For now, I'm trying disposable papers (Pec Pads). A lot of people like Kimwipes. (Oh, and I had some Canon lens paper that was pretty much crap too.)