Definitely, those who prefer a “neutral” sound, as opposed to a bit of warmth, will likely not like what I do. Yet, I would never characterize their choices as not good, since for them they obviously are good, e.g., the RK 5U4G that rubbed me wrong. There was a matter of QC and longevity about Sophia tubes raised frequently some years ago. I haven’t come across much of it more recently, and haven’t experienced myself 1-2 years in, but one never knows. As for their RP 300B and the GG3, tbd.