Perrew,
Good question.
No, I have never heard any of these.
I have researched some pretty well though and would say both the Rowland and Krell qualify.
"Best" is a meaningless term without some context around it though. Best for what application?
Without even having heard it however, if you need the best high power SS integrated at reasonable cost, I would say the Class D based Rowland unit would certainly qualify and be of interest for many.
