Upload & Sell: On
The thing is that there is almost nothing that this card solves. Step through the areas where failures can happen:
1. Camera sends bad data to the card
2. Card writes bad data to the flash
3. Card data becomes corrupted
4. Physical drive failure
It appears this card is taking the data written to it, and replicating it over to another partition. So if the camera writes out bad data, the card still only gets one copy of the data and thus it doesn't fix #1. If the card writes bad data to the flash on the first write, it will replicate that same bad data to the second partition and thus doesn't fix #2. It's not two physical drives, so in case of a failure you're losing both logical partitions, so it doesn't fix #4.
The only thing it helps is a very limited subset of #3 where a small amount of card data gets corrupted after it's written, but the error is not enough to corrupt both copies of the file. That circumstance is so rare... I'm not sure I've ever heard of just a single file or a couple files getting corrupted, while the data is at rest on the camera.
I guess it protects against accidental deletion, but I'm not sure I need to halve my card size and write speeds to protect against my own stupidity. And, of course, the use of the term "RAID" is just going to enrage the people technical enough to understand it, since it's nothing close to a RAID.