Hm...this looks nice. It even comes with a Micro SD USB adapter which it very nice as well. I think you've just about sold me on this clever little device.
You could also go with the M3 Simply for the same price, both are made by the M3 team, they just have different interfaces (the early R4/M3 Simply cards could even be altered/turned into their counterpart by opening them up and doing something to one of the parts).