IIRC, pebble had a "vibrate on BT-loss", which could remind you to go retrieve the phone when ranging outside to rake leaves (or forgetting your phone in a restaurant or something).
not trying to start a flame-war, but i can imagine that you get quite some range in the US, if you live in one of those cardboard-inner-walls houses.
in the 30cm thick solid wall apartment i live in my pebble looses connection the next room over, i almost need line-of-sight for it to work. working at my desk, get up, walk 5 meters to the bathroom, watch looses connection.
maybe my smartphone has a weak bluetooth receiver, compared to other models, who knows...
i've seen tons of americans making holes in their walls by punching or falling into them. could never relate myself, i'd have a broken hand or concussion :D
my phone is not very powerful, maybe that's a factor.