Back to the original question, CO doesn't seem to be very big around here. The local club is doing a classifier match this weekend, so I put a Cmore STS on a Beretta and plan to take the opportunity to get classified in this division.
But having played with the gun some, I'm not really feeling it. Maybe it's just that I'm not all that proficient with the Beretta. But I think I like Open or Limited better. Lately I've been playing SS Minor, and that's fun for a change. But I don't think CO would be my first choice.
Now for someone who's eyes have a hard time picking up iron sights, I can see where this would be a great choice. Or someone who can't afford a full-blown Open gun, but could bolt a FastFire on a dovetail mount to their Production gun.
The other side of me is wondering if we have reached a point where we dilute the game with too many divisions. When I started, a local match would have 40-ish shooters, with maybe 2/3 of them in Limited and 1/3 Open. You get a feel for how you rank against several others. Now if you shoot a 40-person match, there may only be 2 or 3 others in your division.