I am here at the junction of sunny UT, AZ, and NV states, shooting a TPC class. Started day 1 with two optic guns, finished the day shooting irons. A DPP died in its usual fashion, sliding the battery contact about as far as I ever seen it. That followed by attachment screws loosening on my SRO, despite being mounted with all the prescribed voodoo of screw prep, threadlocking, and using a good torque wrench. Under 2000 rounds since it has been mounted.
So, the 11/16/2019 red dot optic update: don't forget how to shoot irons.