I've heard good things about Replica series, never heard them.
About test equipment that was used. 3 amplifiers. 1) Crack headphone amp, 2) McIntosh 275, 3) DIY amp SE (Ultra Linear and Triode).
Here all depends on the sound that's desired - I really like very natural sound with a lot of body and texture - to have life like sound. They sounded more like GE tubes, but even brighter and sharper. I have very warm speakers with McIntosh Vienna Acoustics Beethoven, but even then the tubes just didn't deliver. My opinion - although educated, I tried PRACTICALLY every single tube that has ever been made, remember I sell them and have access to practically everything - is just my opinion. Considering the price, I just don't think they worth it.