I have sights like that, not sure if it's the same brand. I bought them after, well I hate to admit this, after I missed a big gobbler at 10 yrds. Right after that happened I got down to serious business about sighting and patterning my SBE, and found I was shooting low. Now with the sites I'm dead on. Duck hunting has been very poor again this year; I haven't shot a box of shells yet. Most of the time the birds come in so fast with so little warning, I'm not really sighting the gun on the bird. I don't know if they help or not for duck hunting but I'm hopeful for turkey hunting.
Ed.