I have some areas that I want to hunt that are massive. We're talking 40 - 80 acres. I was wondering if anyone has used the Sierra Bigfoot coil on their XL Pro and what their opinion might be. I know the coverage is good, but how about depth of detection, sensitivity to coin sized objects, etc. I realize that pinpointing may take some getting use to, since only the front half is "hot" while in the all metal mode, but I can work around that by tipping the coil. So, can anyone out there tell me why I may or may not want one? Thanks. Randy