I forgot to mention that you can also connect to a specific server from the command line:
with password and display being optional (e.g. vnc://hostname)

If you want to try the quality settings, you can add a second argument,
1 for best quality
2 default
3 looks pretty bad

I've also noticed that dismissing the password dialog or giving a wrong password on the command line results in the program not closing properly and draining battery... (use killall presencevnc-bin or stop the server if that happens to you)