Jim,
The M6 is hands down my favorite detector of all time. I have used probably 6-8 different models of detectors over the 20 years or so that I have been in the hobby. I'm probably a little biased toward the M6 because I found a nice gold ring with it less than an hour after I took it out of the box. Before the M6, I had spent a great deal of time trying to learn the DFX. I read everything I could find on the DFX, and yet each time I went out with it, I worried whether or not I had all the settings right. The same was true with the Minelab Explorer SE.
Not so with the M6. It is wonderfully simple. I'm sure each time I go out with it that I'm getting the most depth possible with whichever coil I am using at the time. 99% of the time, I use the 4x6 shooter coil. It gives good depth (silver dime at 6-7 inches), fantastic target separation, and is wonderfully light and easy to swing. The 6x10 coil covers the ground better, gives a little better depth but is a little heavier. The stock coil offers the best pinpointing of any coil I have ever seen on any detector. The super 12 is pretty heavy, but pays for itself with great depth in areas with widely separated metal targets.
I've used my M6 on saltwater beaches, freshwater beaches, in ghost towns, in long-forgotten trash dumps, in parks and schoolyards and in private yards. The deepest coin I've dug with it was a measured 10 inches on a walking liberty half using the 6x10 inch coil. Because of the phenomenal pinpointing with each of the coils, I can use it in even the most nicely manicured lawns, removing the targets with quasi-surgical precision.
For the depth, the simplicity, battery life (about 30-35 hours), the response time, the accuracy of tone/VID, there is nothing that I know of that compares with the M6. I think it's the best detector value out there.
Hope this helps.
