What are the downsides and or limitations of this electronic scalar healing technology from a spiritual view? Is it safe to use for hours as suggested? What can Creator share with us?

This is safe because it is mild and it is only restorative, so it is realigning things in a way to allow an energy flow. It does not truly have a spiritual dimension but is physical in its impact and makeup. As such, it only influences physical phenomena and responses in the physical body and will not impinge on consciousness, which conveys and comprises the majority of human makeup and the consequences of human experiencing and the many things that can get in the way. It will not repair deep karmic issues and patterns that are instrumental in causing illness. So it is a form of energy healing that can provide some symptomatic benefit but will not address true causes or prevent karmic illness.