I just went from tubes (Rogue Magnum 120) to solid state (Plinius SA100 MKIII) driven by Rogue Magnum 99 pre and I can tell you the state is very solid indeed.
The Plinius amp is very tuneful, nuanced, defined and neutral. The Rogue in comparison had very rich harmonics and amazing depth but was dull and a little lifeless plus the bass was a little thick and ill defined. I liked the Rogue very much but to combine the negatives in sound and the cost of new tubes every 2-3 years and I have less money for music and start feeling a little guilty about not being practical and buying solid state. The Plinius is more often reminding me of real instruments in my room than the Rogue was anyway. My speakers are Maggie 1.6 and I could image if I had other speakers I might have kept the Rogue but, maybe not, my system is not dull but it lacked high end air with the Rogue and not with the Plinius. I had also tried the Innersound ESL amp and I preferred that to the Rogue too.
These comments are after 20+ years of listening (primarily)to tubes.