Sask, I have put 2000 rounds under one. Last summer I was doing some product testing and shot 1000 rounds of .223 and 1000 rounds of .308 ammo under Nkon's M-223 2.5-10 Laser IRT. I was very impressed. I had 3 targets set up and moved from one to the other all the while making sure the laser picked up my target and ranged before firing. No issues at all. It was one hot day as well. 105 deg. under the awning and at one point shooting the DPMS Oreacle in .308 the barrel got so hot it melted my rest to the barrel. Still no issues with the Laser IRT not functioning properly. The rangefinder works and changes as you pan from one reflective target tot he next giving you accurate readings, then you can utilize the BDC reticle to choose the correct circle for your distance.
I showed this scope to many guys at Shot Show and not one didn't say he wanted one. Needless to say Sask., It's on my wish list too.
Drop me a note if you have nay more questions.
You can read more abot this optic at Nikonhunting.com