I'll admit I don't use it that much but.....
Updated my Bondi iMac (128MB) to OS 9.1 from the 3-24-01 OSX distribution package. No problems at all!!
Turned on Speech Recognition (v2.0.4) and it has caused nothing but problems. The most vexing being that it crashes the machine when I attempt to turn it off with the Speech control panel.
Using the OS 9.1 CD I've uninstalled it for the time being but it would be nice to have around for the occasional showing off session with my Windoze geeks!