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!"
The only extended warranty contracts I've ever purchased were for a TV and a DVD player through Circuit City and each of them more than paid for themselves in the one repair I needed on each device with no extra out of pocket expense. I usually pass but on those two occasions they actually were worth while. I also liked that when I got the warranty they recommended bringing the tv in just before the extended warranty expired to have them tune it up and return it to factory spec at no cost to me, or if they couldn't they would replace it with a current equivelant based on purchase price.
But most of the time I blow the warranty off for the vary reasons stated by consumer reports and in the summary above.(example: recent xbox 360 purchase where I decided against it)