I use the ATC2K and the ATC3K. I recently wrote about it on my blog
http://bikesafer.blogspot.com
They are also mentioned in this
thread
post number 6 I think.
I use them in the lower resolution so I can get close to 2 hours of recording without having to change cards or reformat. I can get plate numbers from the video about half the time in that resolution.
Good Luck
Bikesafer
Jeff