As a newbie in the pebble world, I don’t see too much problem so far, and there is a solution on F-droid website to have Weather info on watchfaces on pebble classic and steel who don’t have a native weather app.
Pro : works pretty well and have many updates to come. No battery drain. Health info import available.
Cons : you have to download on the official website app and watchface you want to use in dev mode and install them but it’s well explained on the official website. Some of watchface doesn’t seem to work properly (no tweaking but still display time and basic informations).