We use the Sig Romeo 4S on the MCX platform. It's the solar rechargeable version. Been using them for a couple of a years for every day carry with a lot of getting banged around in and out of vehicles. Very good quality and reliability.
Can't speak for the entire SIG line of optics but my experience with a Romeo 5 says they are good to go. Had the Romeo 5 mounted on a Ruger Redhawk and had it fill out of the case into the dirt. A small rock marred the elevation turret, cleaned it off and first shot with the sight cut the X-ring at 25 yards. The rest of the cylinder and several more placed the rounds in close proximity.