I listen almost exclusively to rock and I absolutely love my Compact 7ES-3's! I occasionally listen to jazz and mellow acoustic stuff, too, and I have to say that the Harbeths handle it ALL very well. The only thing I am tempted to try is a sub to reach a little deeper on the low end. But, what is there is very accurate and suprisingly deep. I'm afraid adding a sub will be an endless game of tweaking for proper integration and I am enjoying the simplicity and fine sound of having the speakers alone. Granted, I do have a small room and don't listen at crushing volumes. The Harbeths are plenty punchy, even for Metallica (believe it or not). Electric guitars sound phenomenal. Imaging is great and as someone else said, driver integration is superb. These are very, very well designed speakers and the unique cabinet construction certainly contributes to the whole sonic picture. It is obvious that every minute detail of these speakers has been well thought out for functionality. They may not be the best looking, but they do look nice in a "retro" sort of way. They don't do all (or any, really) of the audiophile tricks, but present music in a fully enjoyable manner. Of course, speaker preference is one of the most personal issues in hifi. YMMV...