Depends on what cable you are currently using... if you are using the composite cable that the 360 comes with then that isn't a HD lead lead so it would massively improve that... if you are using a VGA or Component lead not so much.
Awesome quality and brilliant price. Dont go spending all your wages on an expensive cable, its a digital signal of 0s and 1s. What youre wanting to pay for is build quality not a big name or the mumbo they preach to you in shops.
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What looks better to you is all that matters and that will purely be down to how your display processes HD sources through each connection (Component, VGA or HDMI). Personally I use VGA for gaming on both my Plasma and Projector.