Over the last 20 years I have bought Marathon Navigator watches as a lightweight relatively low cost travel watch. It was designed as a pilot's watch with tritium glass tubes, has a composite plastic case with a 316L stainless steel back, acrylic Lexan crystal, they are built to MIL-PRF-46374G specifications and are used by US military and law enforcement personnel. The 12 hour bezel for the second time zone is bi-directional and one of the things I have always liked about them is that the turning resistance is high so once set it wouldn't move off station.
My acrylic crystal Navigator below
Now to the upgrade: I ordered one of the new versions of the watch. Marathon have done away with the domed Lexam crystal and have replaced it with a flat sapphire glass crystal, this has changed the look of the watch significantly, and not for the better. It has also made the watch heavier at 46g against the older version at 40g, doesn't sound a lot but it does make a difference and didn't seem as well balanced on the wrist. The reflection off the sapphire crystal also detracts from the dial, on the plus side they have replaced the press-on back with a battery hatch similar to the CWC G10. The watch is also about $100 more expensive than the old version,
The biggest issue I have with the new version is that the bezel is slack when compared to the old version, it is very easy to turn and has little resistance. In my opinion it would be easy to move it off station once set which is not acceptable to me. Presumably the modifications to the case required to accommodate the sapphire have necessitated a different bezel mechanism. Be that as it may but it has to have more resistance than it has to fulfil its functions with confidence. I have also seen reports of the bezel coming adrift, I have never seen reports of this happening with the old acrylic crystal version.
I think Marathon's intentions were good but it just hasn't worked in my opinion and I won't be buying another Navigator unless the bezel mechanism is redesigned to have more resistance to turning.
I returned the watch to Marathon, I have no complaints about their customer service and received a full refund after a few days.
New non-date version below from their website