Is the Amazon Kindle Wi-Fi the best ereader ever?

The Amazon Kindle Wi-Fi--priced at $139--is the best electronic reading device ever, bloggers are declaring. PC World, for instance, says that "Amazon's new Kindle spells doom for other ereaders." This is because the Kindle Wi-Fi undercuts the price of devices such as the Borders Kobo and brings the fully-featured ereader to a reasonable price-point. Article