Yep, as Jeff said, it works a treat.
Do yourself a favour, and download the Bat Grabber software. It's free, and, helps a lot.
When you start capturing via Live View through EOS Utility, you load up the Bat Grabber software, and draw a rectangle around the star and its spikes (due to the Bahtinov Mask). The Bat Grabber software then draws a bullseye and some vectors through the star; these vectors then help you nail focus as they move whenever you make a change to focus. Once the vectors have disappeared, and you're left with just a bullseye, you know you're in focus. It takes all of 30 seconds to get focus.
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