I have an 8 inch EXcellerator coil for my Quattro. I have an opportunity to purchase an 8 inch DD FBS Minelab coil for a good deal. Was wanting to know if there is anyone out there that have used both coils. I would like to know the pluses and minuses of each. If the concentric coil is the best choice all around. I would prefer to spend my cash on another accessory. Any feedback on these would be greatly appreciated. Thanks, Mike