The self openers are indeed wonderful engineering designs, and do appear to work well with shotguns and bird shooting.

However, concerning double rifles used for hunting, the self opening system is quite limited in usefullness, and in some hunting situations, the "one handed" gun opening method has more negatives than positives IMO.

For target shooting, club comps etc, a self opening double rifle might be ok, but for a hunting double rifle, there is not much to be gained by attempting to use the traditional one handed breaking of the gun.