Very interesting to see someone else notice this. I used the original watch since 4/24/15, and now the Series 2 since Friday (both SS). I love the original, size/weight didn't bother me at all. But the Series 2 I found noticeable right away. And when wearing sport & nylon bands, the specific hole that gave a perfectly snug (but not too tight) fit now feels too tight, and actually causes a bit of pain the way the sensor area is being pulled down onto my wrist/forearm. I find myself adjust it like crazy. When I go to the next hole to make it a bit looser, it feels too loose. I think what's happened is that with it getting thicker, the band connects to the watch at the same spot relative to the screen/top, making the additional thickness pushed below compared to the original watch.