Amazfit Pace [1] I just bought one for ~£80 from Gearbest and you can pull the GPX routes from it, and also add routes. You can access all of the files, by plugging a USB lead into the charging dock. It then appears as a USB drive that you can copy files to and from. I've designed my own watch face, as it's just XML and image files and taken GPX data. I'm not sure how or if you can get the heartrate or pedometer data…
No. I bought it when Pebble went down. That thing was buggy forever after, half Chinese most of the time, only allowed sync to a random online service (strava?) and was just.. broken. The worst purchase ever. The display sucks outside. The software is weird (swipe in random directions to find what you want), the companion app miserable. Whatever you buy, this shouldn't be it. A better Pebble would be appreciated ofc.…
What do you mean by the display sucks outside? Couldn't you see it? Was it night time?