If they're made to work with the stock master, then the internal volume must be about the same as the stock calipers. So, other than the advantage of the longer lever created by using 14" rotors, you're not getting much of a performance benefit. Although you have more pistons, they're going to be much smaller than stock. So, your brake pads will be longer, but narrower. You might see a small increase in swept area, but not much. You'll also see a small benefit from spreading the force across the pad more evenly. Don't get me wrong, you'll see better stopping distances than with the stock brakes, but not as much as with a set of brakes made for high-performance use. I'd say, for the price, they're probably worth doing just for looks, especially if you're looking for show points.
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