J'écris cet avis en Anglais pour qu'il soit lisible de tous.
I share the other comments when it comes to Tube break-in. I went from Electro-Harmonix tubes (OEM on my Synthesis Roma) to these PSVANEs. At first the sound was dark and fuzzy. The voices were not forward anymore but in the far back of the sound stage. It's a derouting experience when you know they cost quite a fortune. But after 20 hours of listening the sound began to open.
Quickly after, voices were soft, warm, soundstage was clearer, and the highs were clearer.
Once you let these babies break in sufficiently, you get a good upgrade and lushy sound.
Tubes on themselves are gorgeous and the packing is top-notch. You have a verification sheet that proves the matching of the tubes with obtained results from the factory (handwritten).
The minor con I see is in the price/benefit ratio. You need to embrace diminishing returns with these tubes. Compared to my mid-life OEM Electro-Harmonix, these PSVANE brought just around 20% of an upgrade (if you consider slightly more open sound stage and clearer highs). But if it had to be done again, maybe I would've spent these 350€ somewhere else for more results.
Note : I'm using these tubes after an excellent phono preamp, on a mid-tier Tube Amp (Roma96DC), listening on vinyl only over wonderful vintage Cabasse speakers.