Have you looked into the change in the standard? I would be willing to be the difference is negligible. Even then, I would also be willing to bet that your X-11 would meet the new standards anyway.
But, Shoei is not going to invest money to certify an old design.
yeah, i looked into it. i'm not going to make a statement one way or another on if it meets the new standards, but there are newer helmets that not only meet the new standards but have been tested and exceed the performance requirements of the new standards.
but, don't get me wrong, the X-11 is a great helmet and has saved my noodles more than once (not the same crashed helmet, of course). i just know there is better out there now. that's where my head is and is going to be. this is just my personal approach to safety.
In case you're curious, I'm going with Bell. Buy American! :D