Sound Blaster external USB sound cards w/ Dolby Digital Live

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Most sources recommend this older device:

Creative Soundblaster X-Fi Surround 5.1 Pro USB

http://www.amazon.com/gp/product/B0044DEDCA

This appears to be the newer version:

Creative Sound Blaster Omni Surround 5.1

http://www.amazon.com/gp/product/B00EZT7RE4

Has anyone upgraded from the X-Fi to the Omni? Or have any experience with the Omni to share? I'm specifically interested in the Dolby Digital Live performance for 5.1 gaming optical output.