Let the hive mind of Engadget get that for you.
"We need a digital camera that can be switched on and fire off that first shot fast. It's not a commonly tracked statistic on any review site, and nobody seems to have this information for every camera. We were hoping other readers could inform us as to what small digital cameras can fire off their first pics in under a second (ideally under half a second). It needs to be small, but mostly, just really quick in operation. Thanks!"
I've got this one and put it on MacMini, so far so good! The software come with the package, doesn't allow you to change the record quality, this made my hard disk having less free space. But it seems if you pay 20 some bucks to upgrade it will be able to adjust the recording compress rate. I'm not sure thought.
Anyway it is worth to purchase, I am also willing if the Linux program tvtime can support this device, anyone has this kind of news?