Amazon's estimate of "a few seconds" is a bit optimistic, but it did take less than a minute before a PDF we sent ourselves popped up on our homepage.

ENGADGET: Amazon Kindle Paperwhite review

They take up less room than the older generation of rear projection systems (or larger CRT TVs) although the do have a bit of bulk.

ENGADGET: HD Beat Reader Review: Sony's 50-inch SXRD HD