I did get a chance to audition a VTL 5.5 series II for a week and it was much better. There was a small wiring error in my first one and VTL was very quick to address the issue. The VTL series II as a whole was better than my 21A. The VTL had more information at the extremes, bass was deeper and tighter, the highs were more detailed with more air and my system conveyed more of the music. That being said, my 21A is quieter, the midrange is lacking of nothing and perhaps a little more warm and relaxing, very nice to listen to. If I could choose between the two on a whole I would pick the VTL 5.5 series II, BUT the VTL is $6000 and the Belles half that when new and the diffence is small. I could easily live with the Belles and be happy ever after. So am I going to live with the Belles? I don't know, I am going to try a Herron VTSP-3A as that might be the ticket. I am also going to further consider the VTL with phono as it is a very good amp and I have a hole being burnt into my pocket. But I will not give up the Belles easily. PS mine is the Auricap and I strongly recommend this upgrade as well as a set of still points and a little tube rolling.