Has anyone experimented with VBR (variable bit rate) mp3? I was considering transferring some music for car or casual listening at 192K or 256K, but VBR has piqued my interest. A co-worker tried a few transfers with VBR but then has experienced playback issues. Also, because so much of his music is not filled with ‘simple or quiet’ passages, he felt like he really didn’t save any storage space. In the end he went back to a constant rate. Experience and opinions?