OK, good. I'm glad to be corrected, that is starting to look promising.
Compare http://www.horde.org/ingo/screenshots/rule.png . For now, ingo still appears to be more capable-- e.g. I find it essential to be able to mark messages as "Seen" as I file them. But roundcube is a good product under steady development, and I won't be at all surprised if they catch up or surpass ingo.
Try to use sieverules plugin from http://www.tehinterweb.co.uk/roundcube/. (http://www.tehinterweb.co.uk/roundcube/plugins/sieverules.jpg) it has more features implemented than managesieve.
I've been using ingo and am happy with it, but to use it you have to install and configure the whole horde framework-- a good amount of work, and the only part of it I want is ingo.