I have a HD Hero, brilliant camera. No need for the extra mic, the sound is good inside and out with the open case if the camera is facing forward. I use the spot metering inside and out and its good, I have set it up to record when you press the button on the front for handiness when in the car. If you are going to use the full 1080 get a good (class 10) memory card, and you will fill a 16GB card well before the battery runs out. The sticker mounts are great, they hold on really well, but I mounted it to a fog light with the sucker once on Spuddys car for a drag run, stayed on to 125 mhp so it gets a good grip as well! Only flaw it has is you really need a laptop with you to see if you have got the footage you wanted as there is no playback screen.
Inside
[video=youtube;7_OxK5BSnek]http://www.youtube.com/watch?v=7_OxK5BSnek[/video]
Outside
[video=youtube;YeAZt8XjW-o]http://www.youtube.com/watch?v=YeAZt8XjW-o[/video]
On the fog light
[video=youtube;lKbSL_GWyzA]http://www.youtube.com/watch?v=lKbSL_GWyzA[/video]