Sorry to revive the old topic, but Wi-Fi on this PM works well.
I use PM 9600/300 and Cisco Aironet 350 Wi-Fi card and OS 9.2.2 installed with OS9Helper on SD Card which is installed in BlueSCSIv2.
In order for OS9 to easily connect to the network, I use an additional guest network without encryption, but with MAC address filtering. All modern routers can create guest networks.
I can browse this site using Classilla or other sites that this browser may still display.
I also connect AFP and NFS shared directories, and I can share files.
The speed is not high, yes, but it is suitable for transferring small archives or screenshots. I noticed only one unpleasantness, if you download a large file (for example, 20 Mb), the mouse cursor is twitching.