I haven't had any experience with any HD cameras, only SD ones, and a plenty different kinds, so I'm not up to date on brand new technology with camcorders, but damn, I really love my M300. It's fantastic. Beautiful picture quality, especially outdoors. Indoors is even good.
I do notice a slight noise on the playback when the zoom is used. I don't always notice it, though, which is odd, but it's there sometimes.
If I wasn't into home theater, I'd have a whole lotta money.