I just bought a Primos Ultra 46 HD and have been learning its capabilities. My reasons were two- fold, random home security rolled into a trail camera.
http://www.amazon.com/Primos-Truth-Camera-Detect-Sensor/dp/B00AU6DQ5U/ref=sr_1_3?ie=UTF8&qid=1426798189&sr=8-3&keywords=Primos+Ultra+46+HDAfter using for a few various locations around the home and yard, I have noted the following:
a) It takes a LOT of photos, it got me 6 times during mounting and I was being careful.
b) It photographed patrol cars and others on our street, but not mine in the early a.m. (must not have been enough engine heat)
c) Nighttime photos are black and white and not so "HD"
d) The camera does seem to have a good detection range (60 feet or so).
e) There is a slight delay between when an infrared object enters the field of view and the trigger breaking (about one second)
f) The daytime photos are brilliant
g) Every photo has a footer with date, time, and temperature.
h) You will want a big SD card
i) The online reviews are great and they claim this particular camera is the best for its price.
j) There is a security box and steel cable lock available so no one can steal your camera.
k) It is fairly covert as it requires no flash- all you see is a mass of red light as it detects and then triggers the camera.
Read up on the reviews before you purchase, but I would recommend this one to anyone interested.