I've looked through several and own a Romeo 5 dot sight. Not just with Sig, but at similar price points the glass is going to be pretty much the same regardless of the manufacturer. Sig offers optics at several price points and they are no different. If you buy a $200 scope from anyone they will be very similar. Same with a $500 or $1000 scope.
The difference is in the features. Do you like the reticle choices. Are the focus, windage and elevation adjustment dials to your liking. What about eye relief, scope weight, and general appearance. Some scopes look like you're peering through a cardboard tube with a thick black ring showing around the edges. Others have much less black showing. Once I settle on a price point those are the deciding factors to me.
