The Cefaly prevent is worth it.
I really like the Cefaly. I think it has helped quite a bit and it's nice to not have another maintenance medication to take. I have noticed that my abortive migraine medicine works better too.
One great thing is that, while I still have migraines, they are not as frequent, and the day to day headaches have almost disappeared.
I do rather wish I had purchased the prevent system rather than the dual system. I have not been able to adjust to the intensity of the acute setting, so that is something to consider.