Before I buy I normally look at the rating, first the 1 star then the 5 star. There were a few concerns from reading the 1 star rating but enough 5 star ratings to make purchase. My one big concern was the fit. I've had multiple MP3 players and a pair of Jaybirds. None would stay in my ear properly so I missed some of the sound. Not with these though. After finding the correct bud which only took a few minutes I can say they are amazing - they stay in my ears and the sound is great. Went for a 5 mile run today with 80-90% humidity thinking if they were going to slip now would be the time but didn't have any problem. Initially I had some problems with "drop out" while running but thankfully it was my Garmin not these buds. Garmin recently upgraded the music part of the the app, now I get zero drops while running. The pairing with my watch was so quick compared to the Jaybirds, initially maybe 30 seconds but at each use closer to 3 or 4 seconds - amazing.
Really like the charging box. Just take them off, put in the box and they are charged plus the box stays charged for some time. I've plugged it in once since I've had it even though it wasn't needed (around 3 weeks of use).
If there was a negative it would be against the supplier. These may be a used pair even though they look new. The instructions says to take the tape off the charging probes before use but there wasn't tape on these. Also took almost two weeks to receive after ordering.