I have an Indivision Mk II and the internal CF adaptor. They don't interfere with one another as the CF adaptor sits on top of the PCMCIA port. You can still use a NIC in your PCMCIA port as it fits in underneath the CF adaptor. Both lovely bits of kit. I mainly use my Indivsion for Workbench Productivity stuff and the HighGfx mode I love.