After using my new AG-DVC30 extensively for a couple weeks, I have good news and bad news:
The good news - the video quality compares very favorably with other prosumer camcorders in its class (Sony DSR PD170, etc.), the optical image stabilization works very well, the 16x Leica lens is magnificent, it works well in low light situations and it's pretty hard to fool the auto focus, auto iris, auto white balance, etc.
I was doing some taping for a RailFan video producer and had the tripod set right next to the tracks. A heavy freight rolled by shaking the ground but upon playback, the OIS had removed any trace. I even accidentally kicked the leg of the tripod a couple times and the OIS took that out, too.
The bad news - there is an intermittent buzz in the audio, the source of which I have not found yet. I read something about this condition early in the production run but thought they'd have had it corrected by now. Apparently, opening the swing-out monitor was being blamed for the buzz. In my case, however, it happened when I was using the viewfinder. I guess I'll have to call the vendor and see what can be done about it. I won't be able to use the unit professionally until I am assured it will function properly every time.
Watch this space...I'll post updates as warranted.