Installed it. Nice app.
I needed to force quit the Juice Watch iphone app and then reload it to get it to recognize that my watch was connected. Possible reason: When I first loaded the app, my watch was charging, not on my wrist.
I like all the settings. I like that it's $1.99 - i.e, that it costs something. Gives me a quick flash of happiness to support developers with clever ideas and the gumption to implement them.