I have tried them all, the Briley companion tubes, fitted tubes, Chambermates, and the Rhino Stingers.
They all pattern OK and I have shot skeet with all gauges, only used the 20ga on sporting clays.
The full length Briley tubes were too heavy in my Browning 525 30" 12ga so I sold them. I still have a companion Ultralight 28ga set for my Winchester 101 W/26" bbls.
The Chamber mates worked best in the .410ga. I did not like the other guages.
I ended up with the Rhino Stingers in all three guages. They are 15" long.
The advantages of the Rhinos are less weight, well made, two different choke tubes for each guage, and they will work on any of my 12ga shotguns.
The disadvantage is the o'rings. They do not seem to last too long. You also need to figure out what sizes work the best on each shotgun. When properly installed the tubes will stay in the shotgun when you eject the empties.
Bob