Consonance Cyber 800/845 Valve amps; how good?

Peter, the 845 must truly be some kind of musical experience. maybe one day i'll have the 845 with a matched speaker as a second system. Right now I'm concentrating on upgrading my amp and speakers. I'm sticking with the KT90 tube. Its the one I've found most dynamic for orchestral, I feel no need to change. As you know every tube will have a tradeoff. The KT90 vs the 845. Am i willing to sacrifice some of the bass and treble fq's in the 90's for a certain midrange magic of the 845? No i am not. Only would consider the 845 as a second system, never as my primary. Is the 845 a warm tube or cold/detailed?
If you say the former I'm sure its not for me.

Peter I'm confused about your comment "if you need an aweful lot of power...300B logical choice". As I heard a 300B (not sure if it was Cayin's pushpull or single ended version) anyway hooked up to Silverlines and for light stuff they were excellent. But when it came to complex orch, they fell extremely flat.
So how are the 845's when high dynamics are demaded in complex orchestral?

Hi Audio, just on the one amp I own , the JOR. I've heard this amp through several speakers and had simuliar results, that is dynamic/detailed/fq separations. Not warm at all. Speakers heard the JOR through were Cabasse (MTM model 4 yrs ago), Mirage1's, B7W 602's, , Thors and Tyler LSS's. The Tyler was the cleanest image. This amp is colored only by the choice of speaker. There are few KT90 amps avaliable, I see Pacific Value is offering a new Ming da KT90 that looks of interest.
Peter, I do not think the 845 will deliver the dynamics in classical , at least not how I want to hear them. Like I say as a second system it'd bea great experience for some easy music and chamber classical.