I waited until Rockmelt had a few updates before joining the beta to produce this screencast showing the setup, basic functions and my opinions on the interface. I focus on ease of setup and usability once installed.
Overall I was happy with the speed of configuration and ease of use. I was concerned with the mass appeal of this tool. I think hardcore Facebook users would get immediate benefit. Early adopters will have a hard time staying in the UI with the other tools we have already entrenched ourselves in for Facebook and Twitter.