It looks like you will be limited to a short battery life. It plays 16 hours on a 1.5 AH battery, which is shorter than the JB3 with one battery. I would guess max recording time would be about 2 hours. I'm not sure if a second battery could be added or if you could buy another and swap them out, but you could rig up a 5V external power like people have done for the JB3. If they seem like they have good support and have updated the firmware to record wav, it might be promising.
Do you have an external A/D converter you plan to use? If not, you may consider the Neuros model. There is at least one person on this board using it.