I have an Explorer SE with the 10" Slimline coil. A lot of folks are saying that the SEF or Minelab Pro coils are vastly better. Is this true? I seem to be doing OK with the old slimline coil and am torn over going through the trouble of upgrading. My buddy is running an Explorer II with the 12x10 SEF and we occasionally check each others targets. So far we have both been able to detect and pinpoint the same.