The lack of multi-device support isn't too much cumbersome?
Also, do you not fear, due to the gossip protocol, that your private messages may be stored forever by peers and one day, your private key leaks, and all your conversations are publicly exposed?
I am not overly concerned about leaks of my private key, although the risk is certainly there.
One think many people have to get used to, though, is that the log is append-only: once you've published a message and is no way to delete or undo the message — is it there for “all eternity”. The positive side is that you're more conscious about what you post and why, because there is no way of taking it back.