The HF S10/S100's new Custom dial looks, feels, and operates similarly to the control dial on Sony's prosumer models. That's a good thing--it's a comfortable interface for adjusting options like exposure and focus, though I'm not fond of it for cycling through the Zebra and peaking functions.
The wide zoom switch has an excellent feel, with enough resistance that it's easy to operate at a consistent speed. The power button, however, which sits slightly recessed in the camcorder body, is just a tiny bit too hard to press.
At first I thought the positioning of the mics on either side of the lens barrel would result in extraneous wind noise, but that didn't happen. And it does allow for larger mics and better separation than you usually get when they're mounted above or below the lens, which seems to make a difference. The HF S10/S100 has very good audio.