title: Is there a 'catch' with FastFormat?
body: <p>I just read about the <a href="http://www.fastformat.org/" rel="noreferrer">FastFormat C++ i/o formatting library</a>, and it seems too good to be true: Faster even than printf, typesafe, and with what I consider a pleasing interface:</p>
  
  <pre><code>// prints: "This formats the remaining arguments based on their order - in this case we put 1 before zero, followed by 1 again"
  fastformat::fmt(std::cout, "This formats the remaining arguments based on their order - in this case we put {1} before {0}, followed by {1} again", "zero", 1);
  
  // prints: "This writes each argument in the order, so first zero followed by 1"
  fastformat::write(std::cout, "This writes each argument in the order, so first ", "zero", " followed by ", 1);
  </code></pre>
  
  <p>This looks almost too good to be true. Is there a catch? Have you had good, bad or indifferent experiences with it?</p>