I use Hyperdrives and have been doing so for the last five years or so. Currently it is a Hyperdrive Color Space O. Reason? Because they are very reliable, as I always employ the write verify (switcheable). So I know for sure that files have been copied correctly. Then they are fast! The fastest transfer rate of all available portable storage devices. They have a good preview screen, supporting also Pentax RAW formats and the manufacturer has good support (I bought from
HyperShop - The Official Online Store for HyperMac + HyperDrive). I also have the external battery pack, to extend off-line live.
Obviously verifying will increase the copy time by about the factor of three and it will shorten battery life proportionally. If you trust the device, you can speed up things and copy more gigs per battery charge.
Oh, as an added bonus the Hyperdrive also verifies card integrity and warns about card-related problems and lastly it also recognizes counterfeit memory cards (at least those, falsely pretending to be SanDisks). I am extremely happy with that device.
Ben