White's continues to be made in the US . . . nothing changed there. The headphone cable connector was outsourced but that has nothing to do with the design and construction of the detector.
As far as leakage, I can't speak for all units for years to come but despite the weather being a tad cold (ice on the creeks), I had the unit in the water neck deep and had no issues with the unit or the battery pod - both of which are designed from the ground up and should not leak with some reasonable care.
The MXSport went through evolution during the pre-release testing and the final version is quite different then what they started with and feedback from testers is what got the product to the finish line. I found it extremely sensitive and targets at 8" sounded like they were on the surface. Changing coils and headphones is a snap which is not the case with the AT's unless you have tiny fingers. The display is well laid out and easy to read which again, is not what other units have in all cases. The flexibility of the MXT platform providing multiple detectors in one case followed thru into the MXSport and by updating components to what is available today, it takes performance to the next level.
Overall it is a solid detector and while we can start the "how does it compare to a XXXXX", it is sort of like the Which Pickup is better - Ford, Dodge or Chevy argument where there is no winner since it comes down to preference. For example, my wife and I went out a week or so ago and she pulled a 1937 class ring as her first signal while I found a lone Wheat all afternoon . . . . does that mean the MX5 she was using out performed by detector costing considerably more? Skill, coil placement and sometimes plain ol' luck tips the scale on many hunts . . . .
The MXSport will fill a niche and provide users with features not seen in one package before. There are may hobbyists that want one detector and do not plan on having 10+ in the closet and this unit will do just that
Andy