The 552 is my second sight from EOTech, I've had great luck with my 512 and added this one for another rifle. I've also had great customer service from EOTech. The only issue I've had is getting to the rear controls with my BUIS and the models that have the side controls come with the riser which I didn't want.
Pros: Rugged, high quality sight
Cons: rear controls
This review was written in the old system and had content requirements that are different than reviews written today.