Rocketfish is owned and operated by Best Buy. Think of it as their version of a generic brand of cereal... its made by some brand name or other but they slapped their own branding on it. Most are low end, but most of their stuff is fine. Over a short distance, a HDMI cable is a HDMI cable; a cell phone charger is a cell phone charger; a SATA cable is a SATA cable. I could go on, but you get the gist.
When it comes to sound cards, if you just need sound and nothing fancy for say, a 2.1 speaker set, it'll do you fine. If you're looking for high-end 7.1 surround with enthusiast controls and options, forget about it.