I have a GF that will start laughing when I just show her the feather. She says it sends chills up her spine, the feather is the worst thing I could use on her for some reason. She just goes crazy as soon as the feather brushes her feet anywhere. I notice too that her laugh is more intense with the feather.
I also notice if that a lot of people give up on the feather to soon, give it a while, the foot will start to feel the feathers effects after a couple of minutes. Start with the feather too, if you use nails first, the soles won't feel the feather as much. yada yada yada ....... I could go on and on, so enough!
Have a good one, and don't give up on the feather, he he!