The features available on the DFX and the XLT are many, as people state, and this of course allows the user to tune the units according to the sites being detected. When I owned the DFX I found myself changing this setting or that setting etc.etc. I found that half the time I was detecting I was doubting my settings because I wasn't finding much deep stuff. So there I go again, changing this or that. It seemed that I spent more time fiddling with the machine instead of detecting. I take blame for this due to my impatient nature and unwillingness to learn the unit. In the hands of someone willing to learn all aspects of the machine and the places being searched, the DFX and XLT can hold there own among the other top brands.
The MXT on the other hand, for me, is plain simple to use. My original intent for this post was to determine if there would be any depth loss or depth increase with the MXT compared to the XLT, since I really haven't used the XLT but three times. If it's the same depth I'd rather have simple. If its deeper,I'll keep it, and suffer thru a learning process.
As far as your concerns as to what machine is good for you, because of the lack of information in the article you read, I can only relay what I know about the MXT since I used this unit the most. I'm sure there are many long time MXT users on here that can help you more than I can. I do know that the MXT does find small items at reasonable depth. I know that it will detect to nine inches in soil (dirt), and ten to twelve inches in beach sand. I hunt on Lake Michigan (fresh water), so I can't say what it would do in salt water beaches as to where you live. Yea, the threshhold is a little noisey, but no big deal, especially when your finding good stuff, it kinda goes to the back of your mine. I used relic mode because of the high tone for accepted targets and lower tone for rejected targets. Set the discriminator low, listen for the good or suspected good signal, and look for that unusual vdi number for some surprizingly unusual goodies. I know this is not in great detail about the machine, but I feel there are others on this forum that know this unit much better than I. I don't want to misinform you,..............cause I ain't no expert. Good Luck & HH