Done it once so far it was when i was switching from, AES to MVS on the NeoGeo setup.
While i was selling... the AES systems plus games i was buying MVS carts at the same time.
By the time i was done i didn't have the CMVS untile a month had gone by.
I remember the waiting part having all these carts and no system to 'try them out.
The day the, CMVS got here i was very excited like some kid getting a xmas present.