Finally got my hands on a 10x42 HT, briefly, in Sportsman's Warehouse yesterday. This is pretty anticlimactic, but I guess every little bit helps huh?
The design is an ergonomic success, with lots of hand room, a comfortable reach to the focus knob, and a secure one handed grab. The armor is gummier and more aggressively grippy then the FL's, giving a very secure feeling, but I don't think it will ever get to a patina. It seemed a little bit heavier than my 8x42 FL, as expected from its magnesium body replacing the FL's composite, but I'd still call it lightweight.
The focusing is slower than the FL, and seemed about like that of the Swarovision: one exaggerated big crank gets you down to 12 feet or so, with lots more cranking required to get down to closest focus. The focus knob was very smooth, like the FL's, with no backlash. The hinge was stiff and smooth.
The eyecups were comfortable and worked like those of the FL, with about the same positions clicking into place and enough resistance between clicks to stay put fairly well. It was easy to adjust so the full field could be seen with minimal blackout. Eye relief seemed about the same as the FL. With cups fully down and my semiwraparound Bushnell "Daddy-Os" on, less than the full field could be seen, about average in that department.
This unit had a problem--the diopter adjustment would not turn. Two clerks tried, but no dice.
In the artificially lit, brightly colored and high contrast environment, I couldn't tell the optical quality from that of any other top line binocular, not to disparage the view in the least, just, those stores are such strange places that they confuse me. I thought it had a slightly bigger sweet spot than the FLs I'm used to, the 8x42 and the 10x56, but that could be a consequence of its shorter eyepiece focal length, which usually brings an improvement there. The typical Zeiss pincushion distortion is present, and panning seems smooth and natural.
All in all the HT seems a worthy successor to the FL and an improvement for the ergonomics alone. The feel of the view is very similar. It would take a finer test in natural and varied lighting conditions to see the anticipated difference in clarity and brightness, the state of the color correction, or an improvement in glare resistance.
Ron