I have owned 3 different Moultrie trail cam models and all three have been very disappointing. The one I was moderately pleased with used a lantern style battery but it kept failing with a "Low battery" indication when a new battery was installed so they replaced it with a different model.

The D-40 and M-40 do not perform in cold weather "period", forget it. The picture quality on the M40 at twilight is worthless. They are either too dark or overexposed from the flash. The flash has about 15 feet of useful range. The Sd card slot on the M40 is in a position that you need tweezers to gain access to. It has an external 12V power source outlet that if you use, it will fry your camera because the camera is designed to run on 9V and there is no inverter in the camera. Plug in 12V and you will smoke the unit. They are designing a proprietary battery to sell you. The temperature reading on the M40 is worthless in warmer temperatures. It always reads very high. The mounting strap loops are very weak. Combine that with the fact that the unit is very heavy. If you over tighten the strap, you will break the strap loops. You are better off to use bunge cords.

The flash on the D40 lasted about 9 months before it failed.

I wish they would go back to the lantern battery. I have many rechargeable lantern batteries. Buying a charger and 6 rechargeable D cell batteries for each camera is not a feasible proposition.

Even though I have a pocket full of SD cards and the Cudde uses a CF card, I think I will make the switch. I am sending my M40 back to BassPro tomorrow.