Drawbacks most center around the less predictable factors -- Barefoot 3 doesn't have an established track record for reliability, and the pricing isn't always favorable against high-end peers like Samsung's SSD 840 Pro.

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"We didn't have a great run, reliability-wise, which was a first this season, " admitted Webber.

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The first railways couldn't rival canals on cost or reliability, let alone lobbying power.

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Wireless carriers argue they don't need rules to ensure the reliability of their networks, because it's in their best interest to do so.

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That argument doesn't mean spit to the New York regulators, who are concerned about the reliability of the online tests and their potential to send people rushing to their doctor demanding a cure for a fatal disease they may never get.

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North American utilities so far haven't reported any problems, said Kimberly Mielcarek, spokeswoman for the North American Electric Reliability Corp.

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Yet air-taxi jets will have to prove near 100% dispatch reliability while logging 2, 000 hours a year, or the air-taxi operators won't buy them.

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If call reliability is paramount, stick with Verizon, and if you want to use a lot of data but don't care about speed, go with Sprint.

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