I tried many, including McCormack DNA-2, Krell FPB 300, and Rowland 8TiHC. I am using Pass X350 now and it's better than all three above. No, I have not tried BAT or Sim which are both very good products. Al Phillipe of Dynaudio NA thought Pass X600 brings out the best of Confidence 5, even better than Krell FPB600 which he currently owns. I do have to agree, X350 is really smooth and open without being "thin" like some solid state.
