I tried an earlier version of the Hyperdrive Colorspace UDMA and although the interface was a bit clunky, it worked flawlessly. It contains a rechargeable batteries so that it works on its own or plugged in. Does not require computer to work. Just turn it on, plug in the card. Looks like the new versions do wireless transfers as well (I didn't look into these however).
To save money and configure my way, I purchased the empty unit and a compatible hard drive elsewhere. Easy assembly. I used the device for a 12 day safari for thousands of raw photos and didn't fill up a 500 GB HDD. Theoretically, you could bring a second HDD if the first one gets near full, and change it out. This does not have RAID capability however.
I wonder if understands exFAT formatted cards and what it does if it hits upon non-standard files, like Canon ML RAW video. I assume it just tries to copy over any all files, but you never know.
I thought I saw someone say something about it got confused by certain types of advanced CF cards thoughm but perhaps not.
It is nice and small and light, although you can get a laptop with 500GB drive for only $20 more. Still the size might make it great for most people. And you plug in a cheap extra large capacity drive.
For someone wanting to do stuff like me, transfering lots of ML RAW, 27MB/s means like 36min or so to transfer each 64GB over. And I wonder if it wouldn't get confused by UDMA 7 cards or exFAT cards and how you could verify non-standard files had even transferred at all.
EDIT: hmm sounds like it only supports and transfers specific formats, so great for stills only shooters, but if you do DSLR video, even internal, never mind non-standard, I fear it wouldn't even attempt to transfer the files at all, so definitely no good for me then
seems like it is samsung netbook (2.8lbs unit alone although you still need to add an external HD) and live with 45 second takes and hope it recognizes all your cards or the ASUS at Best Buy for $269 (model: X401U-BE20602Z; 4.1lbs).