How far have ss amps really come in the last twenty years?


I have owned and enjoyed my Jeff Rowland model 8 ( recently modded and upgraded by Jeff to the last version) for many years. I recently had the opportunity of comparing it ( after mods) to a few of the current ss models from Gamut, D'Agostino, YBA, Parasound, Sim audio, CH precision, Constellation,PS audio,Pass Labs  and Musical Fidelity. The results were very interesting, because to my ears and in the systems that we did the comparison, the Rowland held its own against all but the most expensive D'Ag and CH amps. Even those were only very slightly outclassing the Rowland in the areas of top end resolution...and a tad in the bottom end resolution. Now the thing is that the last revision to the Rowland 8 was designed by Jeff over ten years ago! 
So, my question for those more technically inclined than myself is...how far has the design of ss amps come in the last ten...or even twenty years? 
daveyf

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I think, there is no definitive answer.
On one side, the business lives from the impression that the latest design is better than the model before.
On the other side, you buy/bought brain. With some luck you own a unit done right. From design, layout or parts.
Even when you go to a more modern unit from the same designer, there is no guarantee that it will sound better. Different? Yes. But better?
After all my years with High End I think, most have done something outstanding on pure luck. They made something and it was a 10 out of 10.
The majority of Audiophiles want to invest money after some time. They want to change. And to justify the investment or to be King somewhere, they tell and think, yes, it is better than my former unit. And when it is more expensive, it has to be better. That’s the rule of the High End game.
Audiophiles, who go for a cheaper unit because it is better and talk about that, are rare.
But probably they know it better what is going on.
When i go to High End Shows the last 15 years, my impression was, 80% is for - expensive - ear cancer, 20% is good.
When everything will become better, this percentage should vary. But it doesn’t.