New Delhi, Oct. 29 -- SEATTLE - Amazon's new Kindle Paperwhite pairs a thinner design with new ways to turn pages, but fresh testing offers less reason to expect a dramatic speed upgrade. The standard model starts at $199.99 in the US; the $249.99 Signature Edition adds a metal back and accessory connections.

The standard Paperwhite has 16GB of storage, waterproofing and an adjustable warm light. Amazon claims up to 12 weeks of battery life. It is offered in Graphite, while the Signature Edition comes in Graphite or Seaglass Green with matching front bezels.

Paying the extra $50 buys 32GB of storage, aluminum rear housing, an automatically adjusting front light and double-tap page turning. Those Signature features should not be confused...