I have a trail sentry, but its the 1.3 mp model. Like formula1 said, super fast trigger speed, about like under 1 second, but it eats batteries up. I soldered some leads to it to run external batteries, but even at that they last no time. They don't seem to tolerate any voltage drop. I can take those batteries that appear dead in the trail sentry and use them on my wildviews. The pics on the 1.3 are horrendous....everything appears garbled up. The 2.1 should be better. Flash is good.