To be honest, I "hoped" for improvement but considered that I may not hear anything. I was surprised at what I heard, even it is nothing more than the 1 or 2db increase if that's what it is. I'll continue to listen to various Cd's and LP's and will have an even better idea of what I think of this. I try very hard not to let my "purchase bias" play a role but I know it is not easy to do. That often takes me a longer period of time and at some point, I may think of something as actually not an improvement at all and sometimes a step backward. I went through this with IC's and have done it with various tubes many times.
For some reason, I enjoy this silly process of trying new stuff all the time. Kind of crazy since I listened to the same gear for over 20 years with virtually no changes other than trying a different tube here and there. I've made more changes in the last year than I did in the previous 30 years. It just keeps getting better so I can't complain.