I have a Bushnell TRS-25 on my Sport 2 and a Vortex Strikefire 2 on my 15-22. Both work very well as reliable accurate red dot sights.
Both rifles reside on my Study wall with full magazines and an empty chamber. I have other HD guns, but I will try to get to my Study if there is a problem in the house.
The Vortex is an excellent sight, but it turns it's self off after six hours. The TRS-25 will stay on indefinitely, and I have been testing it to see how long the battery lasts and so far it has been on for 6 weeks with no noticeable difference in brightness. The dot is set on setting 4 which is great for in-home HD, particularly teamed with a laser for extreme close range.
So far I am very pleased with the battery life of the Bushnell. I leave it on all the time, and if I have to change the battery every month or two, so be it. Teamed with my AR, the TRS-25 makes a formidable home defense weapon, particularly since I will be using a 9mm pistol to make sure I can get to my Study.
I know some of you don't have a lot of confidence in the cheap TRS-25, but for me it works.
Just my 2 cents.
Rick