Absolutely fabulous sound quality. Bluetooth spotty
First and foremost, I use these for my in-ear monitors when I perform on stage. I had these custom fit using an audiologist and it was 100% worth it. The sound quality is incredible, light years beyond my expectations and they don't move when I'm moving on stage, and I move around and jump a lot.
I also planned to use these while exercising, and I've only tried twice, but when using the CSX bluetooth cable, the music cuts out all the time. I understand that bluetooth is inherently difficult since the body itself can block the signal, but every time I bend over and if I get further than 10 feet from my phone, the signal cuts out. I'm going to try again when I'm further away from Wi-Fi signals and other possible interference on the golf course, but right now, I'm not extremely happy with the Bluetooth functionality.
I'm averaging out a 3-star rating for the bluetooth with a 5+-star rating for the quality of the actual sound and use when wired to be a 4-star review.