I second what RickND is stating. I have had many detectors but none matching the depth that I have found IH and Wheat cents at with the Sov GT. Before buying the GT, I searched high and low for my next detector. I started seaching with several internet search engines and many of the links kept on bringing to findmall. I then started searching through all the different forums.... then my eyes ran over a few articles by RickND, Critterhunter and by several others and the words they spoke about the sovereign just caught my attention. I was intrigued with the words they spoke and what the sov series detector was capable of doing without the frills of computerized menus, sub-menus etc ( I want to be clear, I am not "knocking" other minelab detectors, I am describing what I was seeking to find in a detector) I read so many articles my pupils needed eye drops lol. Obviously in the end, I went for and bought the Sovereign GT.
I will admit, that if there wasn't this great forum to give me guidance with this detector, I would of given up before I started lol funny but very true. What really helped me was investing in a meter. I have nothing against the AT Pro and have no experience operating one. There are many super detectors out there and are better at things then the Sovereign (Freshly buried items, air tests, etc) I notice once I open the hole and re-check with the GT, many times I can not locate the object. I know it is there its like RickNd mentions, The sov hates the "air gap" and freshly buried targets.
Case in point - this summer I had the awesome priviledge of hunting an old carnival ground that was being bulldozed. In the very beginning I found most of my finds, but as time went on and the heavy equipment starting tossing the dirt around and mixing it, I noticed my finds dropped off significantly. I bet the AT Pro or any other detector that does real well in air tests, would of found more then what I was finding.
summary of my experience and readings - the sov series is an awesome detector for undisturbed ground. When things get dug up and tossed around, I totally agree with what others experience as well: there are better detectors to get the job done.
Best of luck! - Jim