No Android Wear device has that kind of battery life, I agree. I'm not sure what you mean by notifications re-sync. My notifications seem to sync when the watch is re-connected to the phone i.e. they dismiss or appear depending on what's left on the phone. Perhaps you mean something else.
Charges using standard Micro USB - unless your Micro USB is different from mine, I plug in my watch the exact same way I plug in my phone. USB straight to the device. No dock necessary.
Always - On - It goes ambient but screen stays on. Transflective display so visible in direct sunlight.
Watchbands - sucks. But I believe they made a sort of 'dock' or 'enclosure' that holds the watch part and allows you to use your own standard straps. I'm not a fan of this and it definitely counts as a con
Not hating on you for preferring SW2 over SW3 as I prefer to see people choose different devices for their own reasons as opposed to the blind following that you'd see from some.
Also, waiting for I/O!