I do like them. They fall about 3rd on my list of favs (IP and Red IP being 1 and 2). I find that a Derby can be a little rough on the first shave but settle nicely into a second and third shave. I don't seem to have that experience with the other two on the initial shave.
I only ever used one 5 pack, but every single one tore my face up really badly. I had terrible razor burn, which I haven't gotten from other blades I've tried. Perhaps I'll try another pack soon, since so many people like them... but I might just be the oddball.