Just to warn everyone to avoid this plugin. It didn't work for me, and looking through these posts, others had real problems. How on earth it has such a high rating in WordPress I just don't know.
Luckily for me (unlike other posters here) it didn't break my site, but just didn't do anything at all.
As a developer myself I was horrified to learn they'd used PHP shorttags, as this is both disrespectful to the language and simply shows how unaware the developers must have been that many hosts will not be configured to recognise these sloppy standards.
WordPress, I feel misled by your rating system.