You need this if you want your brakes to be the very best they can be! I had already added stainless lines, rebuilt my front calipers, put on new rotors and pads; adding a Master Cylinder brace seemed the next (final?) step. The Cusco brace seems to be designed as the most secure one out there -- and I dig the blue under my hood (although it is mostly hidden once installed)!
However, I cannot echo the enthusiastic reviews that Master Cylinder braces get all of the internet..... Its a solid add on that is pretty darn easy to install but I did not experience a night and day difference.