I have owned 63s, have had them modified by crosby and had occaisionally replaced panels. That being said, I have kept them for almost 20 years. Although they have some limitations, I have never heard anything that matches them. I both listen to rock music and play electric guitar. Although the quads won't play shatteringly loud they are certainly reasonably loud. If you need louder get a powered sub and use a high pass cross over. The quads will play louder and you will get added bass. Nothing I have ever heard produces sound across the range as naturally as the Quad. It sounds like a steal to me.