To Toby's remarks about self opener utility above I would like to add that you can take out the self opening plunger from a Holland type action without affecting its operation as a non self opener. You can keep the plunger for sale time, to add that "self opener" cachet. You do not have this choice with a Beesley action.

A subjective note- I find the Holland action feel noticeably smoother in all phases of operation.