I see that Kellyco has an 8" Detech coil out for the Sovereign now. Looks like they got rid of the 6" coil, unless they mislabeled it as the 8" coil or something. The 8" Tornado is really only 7 & 1/4" big and from what I hear gets excellent separation and depth. I can see why people like using it, but I prefer going smallest as possible when wanting a coil for a real trashy site...And that means the S-5 which is 5.5". I also prefer a round coil like this in a small coil and not an egg shaped coil because that's a trade off in some separation ability in order to gain more depth. I'm more interested in max separation than I am depth when using a small little coil, so I want the smallest round one I can find, and that's an S-5. It still gets good depth, though. 7" on a Rosie I found that hit so hard that I bet it could have been even about 9" deep or maybe more and I would still have heard it. And this was in mineralized soil where my other non-Minelab machines were lucky to get 7.5" deep using an 8 or 10" coil. Very impressive little coil, and says a lot about the Sovereign's abilities to penetrate mineralized ground too.