I hunt with the stock Pro coil but want to get a new coil. I'm thinking about buying a 15x12 s.e.f. but I'm also curious about the 10x12 s.e.f. and the 16" Excelerator. I hunt for coins in parks, fields and school yards. I'm thinking the 15x12 will get me down deeper than the Pro coil and the 10x12 s.e.f. I know the s.e.f. coils are excellent but know nothing about the 16"Excelerator. Anyone hunt with one? Which coil do you think would be the best one? I'll be buying my new coil next week. I appreciate your thoughts. Thanks Dan