I purchased the CompM4s last December. My experience with it is only as range or backyard shooter.
I purchased it primarily for two reasons:
1) It was the latest generation of Aimpoint in use by the military.
2) It runs on AA batteries.
I only get to purchase expensive items once. I want something with support longevity and proven reliability. The AA battery is common everywhere. I have the lithium AA with spares, but a alkaline is easily found.
It works great for me. Target acquisition is quick and everyone that fires my rifle hits.
My $.02 worth.