php4isapi stabilty

I'm about to install PHP on a very heavily used production server.
The server is running Win2k and IIS 5. I'm planning to put PHP 4.3.2 on it. I want to use the ISAPI filter for increaced speed, but I'm wondering if they sorted out the stability issues it had in the early version 4 releases.

In short... is php4isapi.dll in PHP 4.3.2 and IIS 5 now considered stable??

nothing on windows is stable :p

but yes, they recommend you installing the ISAPI module instead of the cgi version