Hi Dan,Im Jon from Tallahasse Fla and I use a Teknetic T-2. i had a ACE 350 and a BH Platinum, sold them love my T-2 with a nel sharpshooter coil and the stock coil. how does the 4000 do? I also hope more people chim in on this site I think the teknetic MD is a super machine , just have to understand what it tells us.I main hunt for coins and jewelry dirt and beach. what s yours? Jon