Did you get an opportunity to handle the watches? The mechanism is quite good, in my opinion. Also, as flyrobyfly will tell you, the "micro adjustable" feature of the metal bracelet is truly great.
and it is very easy.
The rubber strap design is not my favorite. Just my personal tatse.
I preferred the old "plain" design much better.
I actually like this rubber strap more than the old one.
While I love the interchangeable system, which to me is the real, crtical, novelty of the Gen 3 OS line.,,I prefer the design of the links in the Gen 2's bracelet (I believe that is so iconic and could not be done better).
Having to choose between the two, I would choose the new interchangeable system but I would love it if the metal bracelet used the older link design.