I've owned a Sony HDR-TD20V since 4/2012, and like nycpaull I have been blown away by the quality of 3D played directly from the camera, viewed on a 47" LG 3D-TV. My videos are of grandkids and of retirement travel. Watching this way is as close to reliving as anything I have ever seen.
But I won't be really be satisfied until I can edit video using software like either my Sony Studio 12 or my Cyberlink Ultimate12 programs to add music, transitions, titles, etc. and put them on a disc that can be played on some 3D player (I have blu-ray) to view without losing ANY of all that native high resolution!! (Rendering to current Blu-ray discs is disappointing, sometimes even jerky when subject motion is moderate-to-quick.)
Until the means to do that becomes available, I will just use a <2 TB USB external HD for storage and playing back, as discussion on this thread has highlighted.
NOTE my main reason for posting: With that option in mind, I want to pass on a tip that the Toshiba Canvio Plus hard drive is really ideal. It comes in a 1.5TB model that measures only 4" X 3.5" X 5/8" and runs totally off the USB connection for its power. Perfect! It fits right in my camera pack with my TD20. Also note, Radio Shack (really!) has it on sale this week for $100, down from $119. After I backed up the Canio's NTSC preloaded software into my computer (should I ever need it in the future), I let the TD20 camera reformat the drive to FAT-32 and copy all its files to it. I was easily able to insert each of my accumlated SDHC cards in the TD20, and repeat the back up process to the Canvio. The camera detected what files have not yet been put on the external HD, and copied only those to the external drive.
(Still, I wish I knew how to motivate Sony/Panasonic to provide software/upgrades for editors, players, and/or computers to play back m2ts files in full resolution/5.1 sound! With the price drop of the new Sony TD30, 3D camera sales should really jump and add to the numbers of consumers wanting this problem resolved. Petiton???)