Just to be clear since I realize that I may have been a bit harsh with these new modules: like everything in the world, things are grey, and these modules have strong selling points, especially the current delivery which is much higher than the 1ET400A. So @Matias is quite spot on to compare them with the 1ET7040SA.
Then in this case we have:
Power in low loads: roughly equal
Power in high loads: Nx500 (if mated with a power supply with rails above 70V)
Noise: Nx500
THD below 10 W: roughly equal
THD above 10 W: 1ET7040SA
IMD 19+20: Nx500 by a small margin
Efficiency: 1ET7040SA
Then in this case we have:
Power in low loads: roughly equal
Power in high loads: Nx500 (if mated with a power supply with rails above 70V)
Noise: Nx500
THD below 10 W: roughly equal
THD above 10 W: 1ET7040SA
IMD 19+20: Nx500 by a small margin
Efficiency: 1ET7040SA