Briley 3-gun Shotgun sight

Anybody have any experience with the Briley 3-gun shotgun sight? Is it any good? Durable? Better of worse than other options?

https://www.briley3gun.com/p-61204-b...ear-sight.aspx

https://www.briley3gun.com/p-61020-f...ont-sight.aspx

I've been adding sights to vent ribs for a long time. (3Gunner)

I prefer this set up, but I really like how Briley does it.
Attachment 106551
Attachment 106552

Would the adjustable sights of the Briley be more useful with different brands of slugs?

Your preferred set up looks simple and robust. Can you recommend someone who can install sights like that?