An M80 is my favorite scouting camera, much better than the M880 for still photo's but the battery life in plotwatcher mode on mine is not very good. My plotwatcher pro that I have coming on at 5 AM and going off at 9 PM will get near 4 months out of a 8 AA's according to current usage... thats a picture every 5 seconds for 16 hours in a row... If I just wanted AM and PM pics I am sure I could get 6 months out of a set of batteries...
One thing about it, no matter which one you use they will tell you exactly where and when the deer use your plot, where they come from, how they move around it, and exactly where they leave it...