We used flash cams for years and still do, I like the night pics much better and only had a few deer shy away but they always came back.
We proved with thousands and thousands of pics of all kinds of animals and yes big bucks to that they work just fine. Yes the IR cams are great to and you don't have to worry about the flash giving your cams away if your on public ground. It's nice to have the choice
Here's a few big buck pics to show the flash dosen't bother them. They came back year after year and never showed any fear.
Don't be afraid to buy them if you can get good deals on them. I have thousands more on many different spots and these picks are from moultrie's to. Good luck!
Tracy