Here's my results:
Lexar 1000x 32gig CF (#1) > OK (1,025,000 bytes)
Lexar 1000x 32gig CF (#2) > OK (1,025,000 bytes)
Sandisk Extreme 60MB/s 16gig CF > OK (1,025,000 bytes)
Transcend 133x 16gig (#1) CF > OK (1,025,000 bytes)
Transcend 133x 16gig (#2) CF > OK (1,025,000 bytes)
A-Data 'Speedy' 8gig CF > OK (1,025,000 bytes) - (Not sure on speed of this card - prob crap

)
Panasonic SDHC (4) 16gig SD > OK (1,025,000 bytes) - (Not sure details of this either - i normally use this SD card for ML)
I ran all the above tests by putting the actual test firmware on the individual cards without having the SD (from bottom of list) in the camera running ML like i have been with the alphas - just to be sure it was only testing those cards.
None of my cards seemed to do anything odd - the led blinked.. then went pretty solid as it wrote the YUV422 liveview buffer file (or whatever), then took a photo in live view mode and exited back into live view. Did i do something wrong or am i just lucky with all my cards? I DID format every card before adding the firmware and testing, maybe that helped?
Thanks Alex!!