Having owned and worn Pebble watches for the lifetime of the original company and then some, I think you would be _stunned_ at how many little things Pebble got right that others didn't. Personally, nothing has come close to these devices since the release of the Pebble Time.
PebbleOS was quite polished compared to the other RTOS out there.
The animations were smooth most of the time, and responsiveness was great, the concept of the timeline is genius. The Pebble team made sure that it was accomplishing its main purpose (always displaying time, and time related events) really well, and then built everything around that.
I hope this revival will be sustainable and bring back some of that brilliance.