Indeed they are! I have two 32GB XQD cards and a reader that I bought in B&H, I must admit they are fast when it comes to downloading via USB 3 but not all that much faster than the 32GB CF cards that occupy the second slot in my D4. I’m not sure I would choose XQD over CF at current prices. What does surprise me is that Nikon can’t/won’t standardise on a single card type. I already have CF, XQD and MicroSD cards and there are Nikon cameras that use SD. I’d prefer to carry just one type.