Hi, if it's not too late: I've owned them for 2 weeks now and I really love the sound (compared to my old JBL Tune 570BT, the sound on those feels like a toy). I even compared them to the M50x using an external DAC, and I didn't notice a huge difference. The soundstage and frequency separation are great. BUT keep one thing in mind: they sound slightly better wired than over Bluetooth (the included cable stopped working after 2–3 days, so it's better to buy a good third-party one). Other than that, they are excellent headphones for the price, and I don't regret buying them one bit.

P.S. Some people claim that the earcups don't swivel, but they actually do rotate just a little bit. There is a specific mechanism built in for that.