Not good if you have arthritic hands. The vibration seems very strong and actually hurts, (unless the one I received from TJC is faulty).
I have not tried it on my hair, I received it, charged it and then turned it on, managed to hold it for about 5 seconds before the pain was too much.
I am now told I cannot return it as I have 'used' it, but they didn't mind keeping the promotional item I received and then returned with it.