I am wondering does anyone have any emi issues with the cz3d. I currently have an omega 8000. Great detector but every once in a while i will go to a site and it will have severe emi issues. To the the point you cant hunt. I am looking for a second detector and really like the cz3d but wanted to make sure they were not too affected by emi. Also they seem pretty simple. Is there a big learning curve with the cz. Thanks for any advice.