I'm using the Panasonic KXL-RW10A without any problems. I never experienced any, and I tried listing the RPMS directory of a RedHat CD, it worked without any trouble. Even accessing the kernel-source RPM on the cd worked. Kernel is 2.2.1[4-7pre12], pcmcia_cs version 3.1.1[4-9], nin_cs version 1.0.2, controller is a TI1225.
If you have any recipe how to make it definitely fail, let me know and I'll give it a try. Also, if you like to get my configuration, I'm happy to send you any information you like.
I've just one problem: the cardbus driver doesn't work yet, it always times out cause the driver only finds the SCSI controller, but not the drive :|