Same here. I get great results with Derby's in my Shavette. I buy the half blades and have never tried one in a DE. I mainly use Voskhod's in my DEI have no idea. I didn’t use a great variety and all performed adequately. I suppose any blades in disposables. I mostly used Personna Blue when I used a DE. I use Derby’s in shavettes I use when I travel and they work beautifully but never used one in a DE. I Hone my own now.