The WSB I have is fine with my 42mm SS. I'm just still adjusting to wearing something on my wrist for almost the first time in a decade, discounting the Fitbit experiment a couple of years ago. No irritation so far, but it did take months for the Fitbit to do that. When it's at all warmer than I like it, it does feel a little sweaty. But I think that's a combination of just me and just reality.
I liked the feel of the leather loop when I tried it on, and I like the look but haven't tried on a Milanese loop. I knew I would need the sport band whenever I did active stuff, like I did my first day mowing the lawn outside. Also, THE LITTLE METAL KNOB KIND OF ANNOYS ME A LITTLE BIT WHEN I PUT MY WRIST ON A DESK OR MY MACBOOK AND IT GOES KA-THUNK. Yeah, that's a little minor issue. But overall, not bad.