The MDT 8000
I've been testing one, they make it sound like a special machine...not PI, not Multi Frequency but something different.
It's claimed to work well on highly mineralized soil and wet sand, I hope it does because inland it was average at best.
Personally I would not rank it as a £1300 machine, I would say £599.
The battery system is bonkers.
I'm pretty confident the top machines will easily outperform it in the field.
You can tell by the videos, the users are all unsure how it works, and they are all static tests.