title: Xcode side-by-side install. Is it fine to use?
body: <p>Xcode offers side-by-side install. However, I haven't tried it but now I'm being pressured to test the new beta SDK (for future projects) while keeping my current SDK environment (for current production). So I'm considering a side-by-side install.</p>
  
  <p>Currently Xcode 4 is not stable enough, but before to install, I want to know possible issues with a side-by-side installation. I'm preparing Xcode 3.x (legacy) and Xcode 4.2 (beta) addition to current 4.0.x.</p>