I'm not a great fan of this feature but I had no idea the HD100 had this function. It's good news I suppose. better to have it than not to have it.

From the Texas Shootout:
http://www.dv.com/print_me.jhtml?articleId=189500064

"Scenes #38-#43 - Round-robin Handheld

We took the cameras outside and had each operator handhold each camera while shooting a martial artist practicing fighting-staff moves, so we could compare handling, image stability, and ease of focusing.

As might be expected, the shoulder-mounted HD100 and XL H1 gave the most stable images, with the JVC capturing the smoothest moves despite its lack of image stabilization. The HVR-Z1 did very well for a handheld. Sony's excellent optical Steadyshot soaked up whatever tremors the operators imparted to the camera. The HVX fell behind the others--its weight and off-center handgrip clearly reduced everyone's ability to handhold it smoothly. Panasonic's optical image stabilization is less aggressive than Canon's and Sony's, and it appears to operate over a smaller angular deflection, so it was less effective in removing handheld jitters."

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See this thread, which discusses some of the same issues: http://www.dvinfo.net/conf/showthread.php?t=70016

Brian- The camera really doesn't have those feature, only in my imagination. It does have auto iris though.