The
Shadow Wireless is a very nice piece of hardware, but nothing is perfect. The most obvious problem with this controller is the lack of motion sensitivity. Many games on the PS3 make use of this feature, and this short-fall can really affect gameplay in some instances. Another bothersome oversight is that you cannot turn the machine on using the center button, as you can with the standard SIXAXIS controller.
While perhaps a bit nit-picky on my part, I found it annoying that the lights that indicate which controller position you are occupying (1, 2, 3 or 4), found on the front of the SIXAXIS controller, are not present on the Shadow Wireless. Lastly, and this is merely a preference, not necessarily a drawback, I prefer the four-button design of the D-pad on the SIXAXIS controller as opposed to the continuous D-pad found on the Shadow Wireless.
Considering I can find the SIXAXIS for around $45 on many websites, the price tag of $49.99 seems a bit steep for a third-party peripheral. If you can find one on sale, however, I highly recommend this controller for games in which motion-sensitivity is not required. It is durable and comfortable and, the above flaws not-withstanding, should prove a solid choice as a secondary controller.