Do you need to see the pictures on this device? I would think that if your purpose was to just offload files from your cards, then continue on your merry way, you wouldn't really view the files. I had 2 different Epson viewers, and they were great.
I guess back to the OP's question, why even have one of these devices? Wouldn't just buying large CF cards with current sale prices be easier and lighter with no power needs? Just get a good sealed storage box, like Pelican or others that make these for cards.
Perhaps there is more intent than what was initially posted though.