Got an appointment for this fitting on 21st July. About 2.5 hours drive from our home. Spoke to Sandra McDonough, the lady who invented it and a PD sufferer herself. She was very helpful and explained it had to be fitted. She said 70% success rate up to now. You take it away to try for 2 weeks. If it works you pay £995 [ roughly $1200] to keep it. Return it recorded delivery, no charge, if it doesn't. Can't say fairer than that.
Main benefits Sandra says are improvement in well being, better speech, walking and balance. Also works for tremor but usually takes longer. There are posts on PD UK Forum, one particularly which causes me to be excited. There is a video on the website of Sandra with the device on and without. She is sponsored by Lincoln University.
Will keep you all posted after the consultation.