We use this daily, sometimes even multiple times a day.  In fact, we really only use the Uncoated book, so the Coated book is useless to us.  )for most people it is the other way around, they used the Coated but not the uncoated).  Because of our heavy use of it, combined with the recommendation we must replace the book annually (yes, we can see the colour fade), we do have to replace it annually.