Because the Shuttle II is realatively cheap and can record continuously for over one hour,
this product appeals to me as a part time Pro and to Amature Photographers.
It seems to me that if they were to add a 5th codec it would boost sales considerably.
My current highest use for output is BlueRay disc.
This only requires a bit rate of 40 Mbps.
So, I would choose DNxHD 40 (or slightly more) if available.
This would allow considerable more footage per SSD
and would require a lot less storage space for original files.