I think it's sensible to buy sufficient spares to ensure that I'll always have at least one ereader that works. That's why I have a Sony PRS-650, a Kindle Keyboard, a Kindle Touch, a Kindle Paperwhite-1, a Nook Glowlight, a Kobo Aura, a Kobo Aura H2O, and a Kindle Voyage (each with a wardrobe of cases), as well as reading apps on one phone, two tablets, two laptops, and a few ancient pocket PCs.

