Modify Detector or Not?

[corblimey!]

I have had rather bad experience with getting my detector (gpz7000) modified by DetectorMods in Australia, and I want to alert people considering the same. My opinion based on my 3 test videos is that it is clearly worse now than the stock detector which I purchased for the tests ( both are s/h). I payed $3500 AUD for their top modifications. Judge for yourself.

 

[Camp Breathedsville]

Greetings and welcome to the forum. I have heard the GPZ 7000 is "stock perfect." What are the mods and what were they supposed to enhance?