I thought I'd chime in and try to revive this one. I've tried Optrix and Walker Ultra Vivid. Most reviews I've seen seem to think the Walker products crushed Optrix but after extensive listening, I have to disagree. While Ultra Vivid initially sounds better and more powerful, Optrix makes the CD sound cleaner and more musical at least for me. I think I will try shine o-la next and see how that one compares to Optrix.
