I agree those targets would be a very tough call on most any machine, But...
Do you have any in ground tests with nails and other iron in and around, above and below your targets.
Above ground shows a lot, but real world targets won't light-up like that.
I know your ground isn't the same as other parts of the world, but in ground is what it's all about.
Don't worry I WILL have one of these as soon as I can get my hands on it.
Great video.. Keep them up..