A neuroscientist turned meditation teacher( ) that I follow recommended the Zengar Neuroptimal EEG biofeedback system to help get past some of the early stages of meditation practice. I called various different providers to get rate quotes and rent a unit for a couple of months. I decided to rent the equipment from Jon at Optimal-Neurofeedback and I am glad I did. My GF and I drove to Sacramento from San Francisco to meet Jon and pick up the equipment. He spent 2 – 3 hours with us training us on how to use the equipment and gave us a free session each. I am really impressed with Jon’s passion for the art and science of biofeedback. He clearly understands the field but has the humility to tell me his limits. He was honest when I asked if meditating while doing the biofeedback would impact the session, saying«I don’t have any data.» A true scientist. :) He was very supportive for the few months we rented the equipment. I think the biofeedback helped to improve my meditation practice. My GF credits it with helping her reach a place of peace in the midst of a very, very stressful job. The Zengar system is awesome and can be used from the comfort of your home. It is far less expensive and far more convenient than going to sessions at someone’s office. I am throughly impressed. Highly recommended. Give Jon a call.