I don't have a GCTP, but I have set it up successfully under Win95 on several Thinkpads(trivial); and with Linux 2.2.15/2.2.16 on a couple of machines, including a HP Omnibook 800cs and a generic tower machine with a PCMCIA 5.25" CardDock adapter that connects to an ISA card - which just happens to have been supported by Linux pcmcia-cs for quite a while.
The main gotcha is getting the ide-floppy.c source/patch with Clik drive support and rebuilding it as instructed.
I still have one minor (unresolved) issue with ppp and the clik drive. For some reason, I cannot successfully connect to my ISP (dial-up connection with ppp) while the click drive is inserted, recognized and ready. The workaround is to perform a 'cardctl eject <slot>' and then physically eject the clik drive (not just the cartridge) before dialing. This is a problem only on the unit with the PCMCIA CardDock (I'd guess that there's an IRQ and/or IO address range conflict).