Here's my experience with using the HDD on the road with the HD2000. First it worked as advertised, but there are a few points to note.
1. You need to have two power points near to each other since you need one for the HD2000 via the docking station and another one for the HDD.
2. Make sure your transfer your SD cards in the chronological order that they were used or your files will be copied in the order that they are transferred. If this happens, you can correct it later by changing the file number in the correct sequence by opening you HDD in Windows.
3. Change you camcorder's time to the local time (if there is a time difference) or you may be confused later when working with your videos by the time-stamp
Here's my workflow to handle the vast number of clips taken. Make sure all the clips are already transferred to the HDD for storage. Format a SD card and copy a day's video or up to 4GB worth of videos from the HDD back to the SD card. Delete unwanted clips and use the HD2000 built-in editing function to cut or join the remaining clips as required. Transfer the edited clips back to the HDD for storage and later further action when I have a more effective software to handle the HD2000 clips.
The manual is not very clear on how to transfer videos from the HDD to SD card. This is the procedure.
Under Xacti Library Menu, select Select Play File and choose either Library Roll or Library Calender. Then go to Playbcak Menu2 and select Copy. You will then come to the Harddisk to Card screen where you can select how you want the files to be transferred - single, selected or all.
I am more than happy with the performance of the HD2000 thus far, apart from the poor IS at zoom. More on this later.