Should be fine, but you may have to tinker with settings. I don't have one of those drives, so I don't know much about the issues. Here's a potential solution I found:
http://alienghic.livejournal.com/382903.html
Some things you'd need to do with any external (at least for USB): You would want to make sure the bootloader was installed to the external drive and add a delay to the kernel arguments in /boot/grub/grub.conf.
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