Product review (5 stars): Can't beat this price for a durable micro dot.
I did not buy this on Amazon.  I bought it direct from Primary Arms about 8 or 9 years ago now.  I mounted it on an AR15 on a UTG "medium" height mount and it's had who knows how many thousands of rounds under it in training and on the normal "square range".  I haven not been nice to this sight.  It's even been rattle canned a few times over now.  I think I'm on my third battery and I sometimes forget to turn it off.  1000 hours is about 40 days if left on continuously, so as long as you turn it off between range and training sessions it should last you a long time.

Not only have I used this on my AR15 I also remove it and use it for airsoft use.  I have gas powered airsoft guns I use for training and play as well and I take this sight from my real rifle and move it to my airsoft rifle when I go out.  This allows you to expose the sight to knocks bumps and use it wouldn't normally see in on a shooting range even in training courses.  I've fallen on it dropped it, dunked it, knocked it into trees, spent hours in the rain with it, ect.  It just keeps coming back for more.  I haven't had to re-zero it a single time since getting it years ago even after removing and reinstalling on my rifle numerous times.  I just make sure it goes into the same spot on the rail every time.

You will not be disappointed in this sight.  And if something happens to it Primary Arms stands behind their products.