I love 3.0 already but 4.0 just blows it out of the water. It fixes the long running bug due to iOS updates where returning to the app would reset whatever screen you had left off to the 'home screen'. Now I can safely return to where I left off when app switching, uninterrupted. User interface is great, and the new text reader feature is something I had been looking for in mobile-form and have finally received. Amazing!! Keep up the excellent work, dev team!