I remember that my Pebble 2 (HR) over time (pun intended) would develop play around the rubber button area especially on the right side. Eventually the rubber covering the buttons would break off. This was common to the point people were making 3d-printed replacement parts. See https://help.rebble.io/pebble-2-buttons/ What's the expected longevity of the buttons this time around, and will you have replacement parts available ?