I have been using a Sony Webbie for about a month now.

So far, I am NOTimpressed.

Reasons:

1) The video lacks contrast. It is almost like looking through a gray filter. The colors are not vibrant.
2) There is no image stabilization. It will record the slightest movements of your hand or vibrations of your aircraft, and being HD, it's very noticeable.
3) The outputfile is not compatible with Deshaker, you will need to covert your video to another format first (which is fine, as you will also need to add contrast anyway.)
4) It does not handle low light conditions well.