Khartago and Stratos Amps - Sound Characteristics

Can anyone talk about the clarity and resolution of these amps?

I know they are highly regarded, but if they were matched up with very resolving and clear speakers would they fall short?

What does one get if you move up the upgrade path for these amps, both of which seem to have at least two available upgrades. Is it just more "oomph", or are there other changes as well?

Thanks