Yep I have one. Its another totally worthless 'Green energy' scam device.
Your house electrical power is measured by true power used not apparent power. The microscopic level of savings would take most of your life time to offset its purchase cost even at $30.
Now the solar panel and GTI system will at least give you a real avoided utility grid purchase number that can be measured from month to month.
However given the market value of factory built solar and GTI systems It will likely die of wind, hail, out of warranty failures or other damage long before its avoided cost pay back breaks even also.
Not always but more often that not the break even point on the purchase is about identical to its avoided cost payback time period assuming the system doesn't break down or need any maintenance by then which is very unlikely.