Technology races on and there are new and far more sophisticated devices available today that were unheard of 6 years ago, and these are incorporated into all of the new amplifiers.
I'm curious to read more on what this statement entails, and what it means for real-world performance.
Here's a shortlist of the "big ones":
Lower distortion, particularly at low power outputs where the amplifier spends most of its time operating.
Higher efficiency.
Cooler idling temperature.
Better control of output stage switching = excellent long term reliability.
Extremely robust and instantaneous protection circuitry for major fault conditions.