I had smartwatches (Moto 360, Pebble Steel and original Pebble) and the interaction with the apps with those watch are fast. With the Apple Watch, opening the apps and having the content shown is really slow. Example: - Hue: took 5 seconds before it shows all the lights configuration - Weather (built-in): took 1-3 seconds to show the weather - Evernote: took 3 seconds to show the main screen - Apple Maps: this is really all over the place - sometimes it's instant, other times it took more than 5 seconds. All in all, wether it's built-in or 3rd party apps, I ended up waiting for the app to be ready to be used. I know that at its current state, the watch need to constantly get data from the iPhone, but I think the watch IS capable of refreshing in the background and caching data. An example of this is the built-in Calendar app. I only have the watch for 1 day, but this is already bugging me to no end. Quite often I just grab my phone rather than waiting.