I definitely think i made the right choice with the AT-pro ,i thought i had a coil problem with mine contacted Garrett,the lady (Sue) said my AT was almost out of warranty and that i should send the whole thing in for a checkup and updates,and i think she said something about extending the warranty,just cant beat that Garrett customer service!! cant wait to get it back just sent it in yesterday,i need it for a group hunt in two weeks