While its still in infancy. iPads open a whole new area for Seforim.
Think how much Seforim cost. How much does a Shas cost?
You can download SHAS for Kindle or iPad for 99 Cents
You can download Tanach for 99 cents too
How many MORE seforim could you have between costs and space (Seforim take up space) if you could store them all in your iPad (or Kindle)