The USB 3.0 rollout is long overdue and the overwhelming popularity of external drives as a backup medium is part of the reason why. Sure, those fancy new ports will work with your mouse, but if that's what you're waiting for, your kind of missing the point. If however you have access to an eSATA port for your external drive, you might want to hold off on USB 3.0 upgrades, at least for now.
A new benchmark released by the crew over at CrunchGear has revealed that USB 3.0 leaves a bit to be desired speed wise, at least in its early iterations and needs a bit more time to mature. Transfer speeds so far have been much slower than the theoretical maximum, but hopefully this will improve over time.
Of course USB 3.0 isn't all about speed. The new bus specification is also intended to accommodate the next generation of power hungry gadgets and drives, and also holds a pretty healthy advantage over eSATA when you start looking at long cable runs. The point here is not to rag on USB 3.0, rather it is simply intended as a friendly reminder that eSATA isn't obsolete just yet.