Since im looking at buying a m6 as a spare detector for my girlfriend and friends that want to come hunt, I think I will chime in. I currently use a teknetics t2, and I love it. I think the t2 is based loosely off of some of the mxt design same operating frequency etc, awesome recovery, good id. M6 is based off the mxt also, its been proven a million times that the mxt is a great detector, and there are tons of guys getting good depth out of both the mxt and m6. So some of your buddies using explorers are getting more depth? No big deal, in the long run you will find more coins I believe and be more successful. Why do I say this? Here is a true example of why I wont use an explorer. My detecting friend and i mostly hunt old house sites, fairly trashy, nails, etc etc. So we were out one day, He took the left side of the sidewalk, I took the right (not a very big yard). After a couple hours we both had about the same number of coins (I was using explorer se pro with the stock dd coil, he was using mxt with the 6x10dd) then we decided to switch sides. Now I think we had both pounded our respective sides very well in the first few hours, I really didn't think there was anything left on my side. Oh was I wrong, about 30 minutes into the side switch I hear him say, "oh zap your gona hate me!" I go over to where he is, and take a nice long look at the walking liberty half dollar he pulled out from about 3 inches down. Now i know i pounded that area where he found it because it was close to the sidewalk near the house, so I told him to put it back in the hole and cover it up with the plug he had dug. I ran the explorer around that plug from every which way, and you know what i got? Nothing, just the typical explorer NULL. Obviously there was some big iron somewhere near the coin, but I was too disgusted to look for it. Any machine should be able to pick up a gigantic silver 50cent piece only 3 inches down
Suffice it to say, I congratulated him on the great find, and proceeded to loose all confidence in the explorer (i put about 25 more hours on it before i sold it). Now in hindsight, I probably should have been using a smaller coil and maybe i would have picked it up, who knows. I always used the slow and low approach with the minelab, and was using a program from one of the UK guys that i was super comfortable with. I probably had close to 150 hours logged on that machine up to that day, so I wasn't a novice, not a master by any means but I knew what i was doing with the setup I had. I'm not really sure what i am trying to accomplish with this post but...for me, and the sites I like to hunt, a good recovery speed is an absolute must. Sure the explorers might be a bit deeper than the mxt/m6, but really, how many of your friends are finding coins past the 7" mark? Next time your buddy finds one he says is deep, go check his hole, better yet watch him dig it out, he might have dug a 9" hole, but missed the pinpoint and the coin is sittin 5" down and a couple inches to the right or left of his hole
From what I have read and talked to people about, the mxt/m6 will go deep, but you have to be able to interpret what the machine is telling you, from most of what i have read (and i have read alot) if you get hits lower than 7" your not gona have much in the way of vdi, but that doesn't mean you cant dig it
All in all i think the most important factor in metal detecting is having confidence in your choice of machine, once you find one you are happy with, learn it inside and out and i am sure that you will outhunt all your pals 99% of the time. Just my 2 cents. Hope this helps.
Mike