The main problem is what one look for. A serious blind test could only guarantee that there is no difference among two different piece of equipment, but what about if there is a diffference? Is A better then B for what? More deep frequencies or better deep frequencies? Is A "truer" then B? etc.
I have listened to enough components, (I don't compare interconnects and wires anymore, as I said above I change them when I need different ones, longer, shorter, balanced, unbalanced), to reach the conclusion that there is no truth and/or perfection. I had components I loved at first listening and after a while were boring and/or wearing to listen to, components that sounded marvellous in the shop and like caca in my home. I always test components at home in my sistem as long as I can. I mean I don't search the holy graal of hi fi, only a sistem I want listen to as soon I am at home back from work, a sistem that push me to pump up the volume, a good help for listening to music. And yes, possibly nice looking because is placed in sight in the living room and sturdy enough to work ten years without a problem and to bear the cat that love to sleep on the working amp.