I have been asked to write a little about my expereinces with these amps
VTL Siegfried
Marco dynamics big! Tonally very accurate with huge soundstage and layering
So seemed to tick most of the boxes
But to me seemed to lack interest, personal opinion but after a while I found it difficult to get enthused
Goldmund Telos
Incredible dynamics
Amazing transparency
Best high frequencies I have ever heard
Total and absolute command over speaker
On the neutral side by far
Possibly a little clinical and "anal" but incredibly accurate
Soulution
Interesting combination transparency, accuracy and bloom
The only solid state amp othe than boulder I have heard with bloom
Tremendous base
Instruments a lot of meat on the bones
Handy as can configure to biamp
Accuphase
Lush and beautiful
Textured bass
Easily drive the speakers
Tone is to forefront rather than transparency, but its all there if you listen
Suppose music hits you more than the hifi
Less "impressive" more musical
CH precision
Like Goldmund but more musical, and tonally richer
Tends to the accuphase side of things but dynamics of the Goldmund
Hope that helps
Andrew