Congratulations! My trusty old iPad Pro is 128 GB, which was max memory back when I got it. My mouth waters at the thought of 512 GB, but not enough to make me reach for my wallet.
My sister just bought a new iPad Pro with Apple Pencil. She's the artist in the family (pretty good actually, plus she's a professional photographer) so I'll have to ask her what she thinks of it after she has had time to play with it.