Status of PHP PDO_Firebird as of May 2011

Working both with Firebird SQL and PDO (but not yet at the same time) I am interested in the combination of both.
According to the documentation the extension is still in experimental status, but I was still curious about how far it has progressed. I decided to redo the experiments Lorenzo Alberton did in an article in 2006.

I performed these tests on PHP Version 5.3.6 with Firebird 2.5 on a Windows 7 machine.