I had a Tru-glo red dot site on my 10/22 since 2008, removed it last week. Initially I liked the difference compared to a scope, but there were problems. The dot was hard to see in normal sunlight, had to turn the knob near to full power, and it would hide much of the target at 100 yards. I had to use binoculars to see where I was hitting after shooting 1-2 rounds. It did not hold its point of aim very well either, had to adjust it every other trip to the range.
I think these have their place for low light hunting, but I put a 3 X 9 scope on it last week and am waiting to get to the range for site in. As a test, I left the thing on for 2 days, this is with the battery that came with it and several days of use at the range already in it's history, still works fine, so the battery is not drained that fast. I contacted the maker and they told me the batteries last quite awhile in their testing. I also carried a spare battery just in case. Now I just gotta get rid of it.
Still, it was a different experience in sighting equipment.