Yeah, I caught the band bug, as well. So far we have a dozen. White, black, light blue, dark blue, lime green, orange, red, fog, Milanese loop, link bracelet, black leather loop, blue leather loop... I change the highlight color on the screen to complement the band. I'm definitely hooked on the watch.
I love using Siri on the watch around the house to turn lights/fans on/off (using Insteon's new HomeKit enabled Hub Pro). I also have a few Hue lights that I control on my watch using its iOS iPhone app watch extension. I'm swapping out the standard Hue hub tomorrow for the new HomeKit enabled Hue bridge, so I can also use Siri to control those lights from my watch. This has been great fun this fall.