Let the hive mind of Engadget get that for you.
"I finally got a new laptop with a lone USB 3.0 port. I'm now looking at getting a USB 3.0 hub with a power adapter so I can use both of my USB 3.0 hard drives at faster speeds. I've read lots of horror stories where some hubs either don't come with power adapters -- and as a consequence the portable drives don't work with them properly -- or they are designed poorly which results in USB 2.0 speeds. Or, the hard drives keep getting disconnected. Do your readers have any suggestions or experience using USB 3.0 hubs? Thanks!"
morcheeba: You have it the wrong way, it is the consumer (that pays first class) that subsidize the bulk mailers. USPS loses money because it gives under-cut pricing to bulk mailers that can't cover the cost to process their mail. So they raise the first class rates to the average consumer.