They are all DVD based camcorders.
The engineers should be ashamed for releasing such poor quality video devices on the market.
ALL DVD based camcorders should be recalled and the folks who purchased them should get their money back. The video is terrible - especially if you want to edit, the discs are a pain and the entire process is unstable and unreliable.
DO NOT GET A DVD BASED CAMCORDER.
Best video quality is provided by miniDV tape based camcorders. DV and HDV do not compress quite as much as other storage media.
Next best are hard drive and certain higher-end flash memory based camcorders.
DVD based camcorder are way behind and provide worst quality video and LOTS of frustration. If you think you are immune, or I am "out there, then read this...
There are more if you want them...
Pro's and Cons of the DCR-DVD305,205, 405