Yes, the slimness and ability to dress up are certainly huge selling points. It does look about 1/4 thinner than the PT2, which is presumably much thinner/smaller than your fennix.
Honestly, even with a PT2 on order, I would consider getting one of these for the occasions (1x/wk?) where I am wearing a dress shirt or otherwise want to look a little more dressed up. It honestly would probably also be a nice conversation starter because you can set it up with a traditional watchface, but then when you get a notification it would obviously not be a traditional watch. And it's so much thinner than Google/Samsung and other round smartwatches, it wouldn't be confused with those.
Honestly, even with a PT2 on order, I would consider getting one of these for the occasions (1x/wk?) where I am wearing a dress shirt or otherwise want to look a little more dressed up. It honestly would probably also be a nice conversation starter because you can set it up with a traditional watchface, but then when you get a notification it would obviously not be a traditional watch. And it's so much thinner than Google/Samsung and other round smartwatches, it wouldn't be confused with those.