The Silver Umax is probably the finest all around detector that Tesoro has ever made. I have one, along with a Cibola, Vaquero, and a Tejon. With the 10x12 coil, the Silver achieves very good depth, but I haven't found that it gets the same depth as a Cibola with the 9x8. In truth, it shouldn't. But like Badger said, depth is not all important. Everyone seems to be consumed by depth, but with my Nautilus IIb, I've rarely dug relics more than 8 inches deep, and it is capable of much greater depth. And the Silver is very capable of digging coin sized targets at 8 inches and more. For air test comparison-quarter with Cibola-16 inches--Silver with 10x12-11 inches. Both had clear signals. Other Silvers may do better or worse, however, that's what mine does, and I'm happy with it.