What does Verapamil success feel like?

A question for those successfully using Verapamil to treat cluster headaches:

Does it give you fewer attack days or does it just lessen the intensity, but you still feel the attacks? Or is it a combination of the two?

Edit: BTW has anyone else noticed their abortives being less effective for attacks that are less intense thanks to Verapamil? Not sure if it's related, but lately my abortives (o2, nasal Sumatriptan, Red Bull) haven't been working very well...