Well, the best digital I have used is the Trail Mac Digital. I have the 2004 model which uses a 3.1 mega-pixel Olympus camera, but the 2005 model features a 4.1 mega-pixel Olympus camera. The sensor is run on 8-AA batteries that will last 3-4 months. The camera is run off 2-AA's, the battery life (like any digital camera) depends on how many pictures are taken, how many pics used the flash, and how fast the pictures were taken (as well as temps). I find this to be the best digital unit I have tried as far as battery life goes.

As far as the triggering speed, I will let this picture speak for itself....


Here are a few to show the quality