Good news for some people possibly: contrary to what was stated above, Gameshark US does accept credit cards registered with addresses outside the US. I recently bought three sets of the MadCatz lights online and it accepted my Singapore credit card just fine. For shipping address in the US I used a forwarding service named Borderlinx, who sent it to Singapore in a matter of days.
My review: I love these MadCatz lights! One light has about as much output as a Philips wallwasher, which is impressive. Previously I used four wallwashers behind a triple-screen Eyefinity setup that I replaced with three pairs of MadCatz lights, and I have as much or more light on my wall. One benefit of the new lights is that because they are brighter you do not have to point them to the wall as much, and by pointing them more straight up they cover a larger part of the wall. It is as if the six lights become one large light source that changes color according to what happens on the screen, as opposed to the Philips wallwashers that felt more like a row of lights. This is more immersive and really feels like an extension of your screen, which is further helped by the MadCatz lights reacting faster and therefore being more responsive to what happens on the screen.
The color calibration is spot on and uniform across all MadCatz lights, something that could not be said about the Philips lights. I still use two of the wallwashers behind my desk to drive two pairs of satellite lights, two pairs of fans, and two rumblers. I have disabled the wallwasher lights because there is no way they can be matched in color with the MadCatz lights, even more so because they all have failing leds by now. I use the satellite lights at the outer edges; the quality of their leds is actually higher than of the wallwashers and can be matched with the MadCatz colors. Too bad their light output is pretty weak. I have removed their covers to use them as indirect light only, like MadCatz has also wisely decided for their design. Another good move by Madcatz was to leave out the audio, which allows the connecting cables to be thin. Their length and their standardized plugs allow for more flexibility than the Philips system did.
The only negative is that I needed six free USB ports to connect just the lights. MadCatz if you are reading this and if you decide to produce the rumble and fans, please design some kind of USB hub where everything plugs in, including a pair of lights. Another thing is that the lights weight so little that they move about easily. Some rubber feet like the Philips lights had would have been useful.
In conclusion, it seems MadCatz really know what they are doing. While they of course benefit from newer led technology, they have improved on the Philips design in just about every way. The amBX keyboard is too gimmicky for me, but if they produce the rumble and lights (and we get some new games that support them) I am now confident they can create something amazing!