Today while testing the XTerra with the stock coil against my CZ6a with 8" coil, I did notice that my CZ would hit the 6" buried penny alot stronger. But I am used to swinging my CZ slow as I was the XTerra. When I sped up the swing speed on the XTerra the hit was alot more like the CZ with a very strong hit, I remembered someone saying the swing speed should not be slow, it does make a difference, so watch your swing speed in the field. Also, wouldn't the 18.75 khz coil be better suited (Go deeper) for relic hunting than the 7.5khz coil especailly if hunting for lower conductivity metals like shell casings, bullets, gold, etc? Have used the XTerra 50 for about an hour and find it user friendly and easy on my bad shoulder. Quarters came in at 42, dimes at 36, nickles at 12 with one boucning from 9 to 12, and pennies ranged from 27 to 36. HH John