Today I wanted to try and convert some mp3 files into opus. I know it's a relatively new codec/format, but since libopus0 is in Debian since squeeze (backported) and opus-tools since wheezy, it was only a question whether gstreamer0.10 and the converting tools already supported it. (I'm running Crunchbang Waldorf which is based on wheezy.) Tried soundconverter and oggconvert with no such luck. Ended using soundconvert to batch-convert into oga with low quality. Gained ~60% of storage without noticeable sound difference. All in all, I call it a win. :) I would still like to try opus, though.