I'm guessing that if a dealer said the MXT and X-Terra were a good comparison, he's either not real familiar with the X-Terra or he's trying to sell you an MXT. Maybe both! I like the MXT. But in my opinion, it fails in comparison to the X-Terra. Although there are some similarities between the MXT and the X-Terra 70 or 705, there are a lot of what I consider to be important differences. Sure, they both have nice sized displays, Prospecting and Coin modes, a variety of coil sizes to chose from and both are manufactured by very reputable companies. But for the type of hunting I do, I like a lot of things better about the X-Terra. For example, the X-Terra has notch discrimination. The MXT does not. The X-Terra offers a variety of tone options (single, dual, three tones, four tones and mulitple tones). The MXT offers a single tone in Coin/Jewelry mode and dual tone in relic mode. The X-Terra has the ability to operate at any one of three frequencies, 3kHz, 7.5kHz or 18.75kHz. The MXT operates at 14kHz only. The X-Terra uses 4 AA batteries. The MXT requires 8 AA batteries. The X-Terra weighs less than half of what the MXT weighs. The X-Terra 705 has manual GB, Auto GB, Tracking, Tracking GB offset, Beach mode. The MXT has three positions, ground, lock and salt. The MXT comes with a 2-year transferrable warranty. The X-Terra has a 3 year warranty for the original purchaser. I like the trigger on the MXT. And the X-Terra doesn't have that. I guess my point is, the VFLEX X-Terra reflects the technology that is available in today's detector marketplace. The MXT, having been around since 2002, does not. The MXT is still a good detector and I've made some nice finds with those I've owned. But having used the MXT and the X-Terras extensively, the functionality offered by the X-Terra makes the choice very easy for me.
Production issues? The biggest issue for an X-Terra dealer is keeping them on the shelves due to the high demand for ALL of Minelab's products. Did you happen to ask him what production problems he is talking about? I'm not aware of any, other than a few ears being broken on some coils when tightening the bolt. I suppose those could be considered a pain to deal with. But I wouldn't consider it to be enough of a "production problem" to keep me from buying one. And for the record, several of us addressed various "at home" solutions to that problem a couple years ago.
JMHO HH Randy