I also run the Moultrie Delta Base cams. Currently have four out and have been pleased with them for the initial price and quality. The cell signal on the camera is better than the one I get on my phone in the areas they are out. You do not have to sign up for their plan but then it is only a SD card type camera. I think I pay $44/month for the four of them currently.
Three are on the unlimited images/50 videos a month and the fourth is in a lower traffic area so that is on the lower plan of 1000 images/10 videos a month. The resolution has been great for me, night/early morning photos can be a little grainy but I think that comes with the territory, weather conditions, and distance from the camera.
One tends to be a little finicky with moisture and will "fog" up a little on the images, still can make out the pictures just not a lot of crisp detail, but it is short lived generally. I did have to send one back to them because it would not connect/work during initial setup. They told me it was an SD card issue but I used the same exact card in the replacement and have had trouble free use out of it. The "HD image" option is nice if you would like a high res image of anything its taken, it just uses five images instead of one toward your monthly limit.
Moultrie recommends lithium batteries in them but I did not go that route due to the cost of the lithiums. I will say, I first put 3 of these cameras out late Oct 2022 and with normal Rayovac alkaline AA's from Dollar General they lasted me through late July 2023 before I had to switch them out with new. The battery life depends on how often the camera is taking/sending images over, the MP setting and if you are doing videos or still images. Mine are all set at the 18MP and upload every 24 hours. I was very pleased with the life I got out of the first set of AA's. If you wanted to run solar panels for them that is an option as well. I have tossed around the idea of converting them to the 6V batteries but haven't seen a need for that just yet.
I put two recent photos in here to show night and evening time pics for reference