I have used Leaf River, Cuddeback, Wildview, Moultrie and Covert.
i think Leaf River is out of business now...they made some decent cameras for a while but i dont think they were able to keep up technologically.
I havent seen any wildviews around for a long time...they were CHEAP...and didnt last long and had pretty crappy pic quality.
I had one Cuddeback...it was great for 12 months and then just stopped working...called their customer service and did not get much help...and they offered to replace the cam with another of the same model for half the price plu shipping charges. I told them to shove it. Now that camera is strapped to a tree along the property line as a dummy surveillance cam. Their whiteflash cams take very nice pics tho.
I have two Moultries (M-80 and M-100) and they are both workhorses. nothing fancy, but they have been reliable. Others have had issues with those models, but i have not.
I have one Covert, a black 40. Its been a pretty solid unit so far. I have only had it for about 3 months now. I dont like the lack of widescreen format like the moultries have, and I dont like that you have to have a back drop (trees or brush) to get decent night pics....basically they suck on a food plot or otherwise open area. I think their red flash cams would be better on plots or in otherwise open areas. I also don't like the units PIR sensitivity. It has 3 sensitivity settings (low, med, high). I have it on the medium setting and if you do not face it pretty much due north you will get sun exposure settings....like hundreds of them...which wears the batteries down a bit. I know that sounds like a lot of negatives..but there are plenty of user related work arounds to bypass these issues. Overall i think it has been a solid unit...especially for the price.