Firstly, the good: for the money, these are incredible ear buds: they fit well, are light and comfortable, have a long battery life and sound fantastic.
The not so good is they can be a bit fiddly in use: sometimes only one side will connect and I have to mess about putting them in and out of the case and turning Bluetooth on and off on my Aya Neo.
Also, sometimes they connect but the sound breaks up and I again have to mess about with Bluetooth to fix it. Once connected properly, though, they stay connected until I take them out so it's more of an inconvenience than a real issue and as I have already said, they represent ridiculously good value for money!