Bought these for running and general training. Whilst they've not been used in anger, first impressions are excellent. The pairing to either my phone or Gear S3 was a doddle with voice feedback to provide confirmation. The voice feedback is a nice feature - none of these random beeps or tones which are meaningless. The buttons are responsive and the LED provides clear indication when charging the battery etc. The user manual is clear and easily understood. The sound quality is more than adequate for exercising as long as you take time to ensure you have a good fit with the various sized ear-buds and ear-hooks, which are all supplied as standard.
I'm yet to test on a run but first impressions are excellent and the 4 star rating may well be increased to 5 stars!