"Not excellent, but good for the price"
Pro: light, comfortable, nice design, sturdy, low price, good microphone for calls (better than the one of my £60 wired earphones), don't fall off your ears (you need to use the correct eartip size), soft cable, connection is stable (tried with phone and laptop), volume buttons controls the phone software volume, multipoint (you can connect to two devices simultaneously).
Cons: very boomy lows (fixable via EQ), no aptX/AAC codecs, the prompt voice (that tells you "connected to phone 1" or "disconnected" or "power off" etc) sounds ridiculously robotic.
The sound has TOO MANY lows, meaning they're boomy and they crackle. However, with the equaliser on your phone you can fix this issue easily and tailor the sound to your preferences.
For the price it's sold, it has a quite good quality/price ratio I guess.